Engine bogs and almost dies when slowing.

Valistener · 05-30-2007, 01:27 PM

This started last night and still continued this morning. Whenever I let my foot off the gas and the car slows down (especially when coming to a stop), the engine RPM goes down to 4-500 RPM and the car begins to vibrate as the engine struggles to stay going. After a couple seconds it recovers and the RPM jumps back up.

It almost acts as though the clutch is not disengaging but I have it fully depressed.

Gerry · 05-30-2007, 01:45 PM

Take the car in. If it does it consistently, it will show up in the datastream. Sounds like an idle air control valve fault.

Rick Tinley Park · 05-30-2007, 01:52 PM

A quick question -- was your A/C on? I seem to remember this being a problem for some last summer (2.4's) and I too noticed it once or twice. But I rarely run the A/C so I don't think of it.

Helios · 05-30-2007, 02:28 PM

Mine still does that when I have the AC turned on.

Ive been meaning to get it checked out since i posted about it September of last year. None of my other Saturn vehicles do this and i dont think it should be normal.

Valistener · 05-30-2007, 03:28 PM

Quote:

Originally Posted by Rick Tinley Park

A quick question -- was your A/C on? I seem to remember this being a problem for some last summer (2.4's) and I too noticed it once or twice. But I rarely run the A/C so I don't think of it.

No my AC was not on neither directly nor in recirculate mode.

I will get it checked out but I was just wondering if anyone else had this problem.

I thought about the IAC but it only happends when it decelerates.

Gerry · 05-30-2007, 03:47 PM

That's when you'd expect it to happen if the IAC looses control.

HotRedRoadster · 05-30-2007, 03:50 PM

I just had a problem with my catalytic converter....its was bogging down my engine, like the more I wanted to step on it the more it bogged down almost to the point of turning off. The check engine light would turn on for about 5 seconds and then turn back off by itself. I took it in to the dealer and they said it was the cat, they replaced it and now shes as good as new. hope this helps

Marco

Antonio · 05-30-2007, 05:40 PM

I had a similar problem on my old Celica.

Here's a question for you. Standing still, place car in gear but keep clutch pressed down. Does your car start to inch forward or rpm drop? If so, you're clutch may be coming up. In my case, my clutch master cylinder was bad and was leaking pressure. It would cause the car to release the clutch and engage the gear no matter where the pedal position was. Just a thought.

GhostRL · 05-30-2007, 06:29 PM

Clutch... cat are both good ideas. Best thing is to just drop it off to get looked at.

GaryH · 05-30-2007, 10:36 PM

Quote:

Originally Posted by Rick Tinley Park

A quick question -- was your A/C on? I seem to remember this being a problem for some last summer (2.4's) and I too noticed it once or twice. But I rarely run the A/C so I don't think of it.

Same here. It happened last summer (delivered June 6, 06). I haven't noticed it this winter. It happened a couple of time recently. I also think its only when the A/C is on. All winter around here has been mostly top down days without the A/C on.

michigan_sky_guy · 05-30-2007, 10:54 PM

Quote:

Originally Posted by Gerry

That's when you'd expect it to happen if the IAC looses control.

Just to clarify, there isn't an IAC (Idle Air Control) valve on this engine.

The ETC (throttle blade) under computer control does what it needs to control idle.

**Skip** · 05-31-2007, 12:28 AM

Check the mass airflow senser. Ernest had a problem just like this....Skip...

Valistener · 05-31-2007, 01:29 PM

Well this morning it hardly did it at all, I doubt I would have even noticed it if I were not looking for it. So either it cured it self or this will be an intermittant problem (one that never happends when you bring it into the dealer). Guess I will just keep an eye on it for now.

coopcj7 · 05-31-2007, 10:59 PM

Mine did this but it seems to be only when I have the air on. Which was when I wanted to make sure that it worked. Afterall this is a convertible I don't need the a/c

e-sarge · 06-05-2007, 01:38 PM

Keep in mind also that most modern cars also run the air conditioning when you have selected any of the defrost settings on your climate control system (not the rear window defroster). In my experience, most of the brands do this to pre-dry the air they are blowing on the windshield (usually it is buried somewhere in the owner manual -- mine isn't handy at the moment), and most also do not turn on the indicator light to let you know that they've done it (it's kinda like a little secret).

One sure way to turn off the AC is to turn the fan to the off (zero) position -- that will not necessarily stop the flow of air into the car, but it will certainly turn off the air conditioning system.

Next time it happens, try turning the fan off to see if it goes away.

Valistener · 06-07-2007, 06:47 PM

Quote:

Originally Posted by e-sarge

Keep in mind also that most modern cars also run the air conditioning when you have selected any of the defrost settings on your climate control system (not the rear window defroster). In my experience, most of the brands do this to pre-dry the air they are blowing on the windshield (usually it is buried somewhere in the owner manual -- mine isn't handy at the moment), and most also do not turn on the indicator light to let you know that they've done it (it's kinda like a little secret).

One sure way to turn off the AC is to turn the fan to the off (zero) position -- that will not necessarily stop the flow of air into the car, but it will certainly turn off the air conditioning system.

Next time it happens, try turning the fan off to see if it goes away.

The fan was off, was not on reciculate and the AC was not on. It was for some other reason it happened. It has not happened since despite using the AC for the last few days.
I'll chalk it up to a gremlin for now.

redmansioner · 06-21-2007, 06:24 AM

Mine has AC problems and my car have difficulties in starting.The clutch gear doesn't engage, my trusted mechanic pointed out the master cylinder has to be replaced.Good thing I found some good quality of the parts so I bought also a good quality saturn spark plug to get out of the stalling issue.

sharondean · 07-10-2007, 03:18 PM

If I have read this right, Valistener you have a manual transmission. Mine is automatic and has recently started doing the same. I have noticed the last few times that my A/C was on. I turned off my A/C and it did not do this again but I was close to work so not sure if it will happen again this afternoon. I can't remember if it was on the first time it happened. I told my husband and he said I probably had just got some bad gas. Did you get yours fixed and what was the problem if so? I would like to print a copy of this for him. Thanks for the good info!!!

tazster2211 · 08-05-2007, 04:15 PM

I think I had this happen to me last night. It was really hot out and I had the top down but was running the A/C. When I'd slow to a stop light with the clutch depressed, I would feel a slight shake/vibration from the engine and you could feel the shifter shake a little like it's trying to recover from idle. When I turned the A/C off, it didn't seem to do it anymore. Has anyone ever got this situation diagnosed by the mechanic?

RealGomer · 08-09-2007, 07:54 PM

Have you tried depressing the clutch when slowing instead of keeping it engaged? Sorry, couldn't resist. After my A/C problems, I'm gettle a little goofy.

tazster2211 · 08-13-2007, 11:44 PM

Quote:

Originally Posted by RealGomer

Have you tried depressing the clutch when slowing instead of keeping it engaged? Sorry, couldn't resist. After my A/C problems, I'm gettle a little goofy.

That's when it happens.. When you depress the clutch and the RPM's start dropping you can see the needle dip below 1K for a moment, it bogs for a few seconds, then the needle moves back up to idle speed. Anyone had this diaged by a mechanic yet?

Boomer · 08-14-2007, 02:34 PM

Somewhat new to the board, as well as new 07 Sky. However, I have indeed noticed that if the AC is on, the car is 'rougher' on the idle, when coming to a stop.

'Tis a stick, and not an automatic.

Because I am lazy

, can someone recap the issues they were having, and the resolution from previous posts?

05-30-2007, 01:27 PM	#1 (permalink)
Valistener Senior Member Join Date: Nov 2006 Location: Wichita, KS Posts: 260 My Photos: (0)	Engine bogs and almost dies when slowing. This started last night and still continued this morning. Whenever I let my foot off the gas and the car slows down (especially when coming to a stop), the engine RPM goes down to 4-500 RPM and the car begins to vibrate as the engine struggles to stay going. After a couple seconds it recovers and the RPM jumps back up. It almost acts as though the clutch is not disengaging but I have it fully depressed. __________________ 2007 Sky 2004 GTO 1992 Camaro RS -305 V8 http://www.skyroadster.com/forums/at...0&d=1163216593

05-30-2007, 01:52 PM	#3 (permalink)
Rick Tinley Park Moderator Join Date: Jun 2005 Location: SW Suburbs of Chicago Posts: 4,819 My Photos: (11)	A quick question -- was your A/C on? I seem to remember this being a problem for some last summer (2.4's) and I too noticed it once or twice. But I rarely run the A/C so I don't think of it. __________________ Find out about my radio show http://www.anj.westpm.net Founder: www.chicagolandroadsters.com Rick Tinley Park Delivered June 15, 2006 VIN - 3099 Sunburst Yellow Name - Sunni1 IL License # - YLO SKY 1

05-30-2007, 02:28 PM	#4 (permalink)
Helios Senior Member Join Date: Feb 2007 Location: Charleston, SC Posts: 365 My Photos: (3)	Mine still does that when I have the AC turned on. Ive been meaning to get it checked out since i posted about it September of last year. None of my other Saturn vehicles do this and i dont think it should be normal. __________________ "Amelia" '07 - 2.4L Sunburst Yellow RPi GT Exhaust GMPP CAI BlackCat Custom Gauges Black calipers Spoiler Tinted Windows Stubby "B" Antenna Lil Chromies Wind Restrictor V1

05-30-2007, 03:50 PM	#7 (permalink)
HotRedRoadster First 2000 Sr. Member Join Date: Feb 2006 Location: Los Angeles Posts: 239 My Photos: (0)	I just had a problem with my catalytic converter....its was bogging down my engine, like the more I wanted to step on it the more it bogged down almost to the point of turning off. The check engine light would turn on for about 5 seconds and then turn back off by itself. I took it in to the dealer and they said it was the cat, they replaced it and now shes as good as new. hope this helps Marco __________________ 2.4 Hahn Stage II (Hahn's Tune Sucks for 91 gas), 19' Kappasphere Wheels, Eibach Lowering Springs & RK Body Kit. Placed Deposit: 2/17/06 Shipped: 7-5-06 Arrived: 8-2-06 Vin: 3371

05-30-2007, 05:40 PM	#8 (permalink)
Antonio Senior Member Join Date: Aug 2006 Location: South Plainfield, New Jersey Posts: 1,651 My Photos: (6)	I had a similar problem on my old Celica. Here's a question for you. Standing still, place car in gear but keep clutch pressed down. Does your car start to inch forward or rpm drop? If so, you're clutch may be coming up. In my case, my clutch master cylinder was bad and was leaking pressure. It would cause the car to release the clutch and engage the gear no matter where the pedal position was. Just a thought. __________________ HAD - '07 Redline -292 whp & 327 wtq - SOLD :( HAVE - '02 Chevrolet Corvette Z06 - STOCK....for now http://youtube.com/profile?user=talkaboutblue NASSOA Founding Member

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05-30-2007, 01:45 PM	#2 (permalink)
Gerry Senior Member Join Date: Feb 2007 Location: San Antonio, Texas Posts: 568 My Photos: (0)	Take the car in. If it does it consistently, it will show up in the datastream. Sounds like an idle air control valve fault.

05-30-2007, 03:47 PM	#6 (permalink)
Gerry Senior Member Join Date: Feb 2007 Location: San Antonio, Texas Posts: 568 My Photos: (0)	That's when you'd expect it to happen if the IAC looses control.

05-30-2007, 06:29 PM	#9 (permalink)
GhostRL Senior Member Join Date: Nov 2006 Location: Fort Benning, GA Posts: 286 My Photos: (0)	Clutch... cat are both good ideas. Best thing is to just drop it off to get looked at. __________________ 2007 Sky Redline Dejon 5027BB & Piping - RPI I/C - Magnaflow+Cutout 365 RWHP 351 RWTQ http://tinyurl.com/26j7kd

05-31-2007, 12:28 AM	#12 (permalink)
Skip First 2000 Sr. Member Join Date: Oct 2005 Location: deep in the land of cotton where good times there are not forgotten Posts: 4,736 My Photos: (0)	Check the mass airflow senser. Ernest had a problem just like this....Skip... __________________ Resident Redneck of the forum and Birthday Greeter Keep on the sunny side of life It tant Christmas without Christ.

05-31-2007, 01:29 PM	#13 (permalink)
Valistener Senior Member Join Date: Nov 2006 Location: Wichita, KS Posts: 260 My Photos: (0)	Well this morning it hardly did it at all, I doubt I would have even noticed it if I were not looking for it. So either it cured it self or this will be an intermittant problem (one that never happends when you bring it into the dealer). Guess I will just keep an eye on it for now. __________________ 2007 Sky 2004 GTO 1992 Camaro RS -305 V8 http://www.skyroadster.com/forums/at...0&d=1163216593

05-31-2007, 10:59 PM	#14 (permalink)
coopcj7 Senior Member Join Date: Oct 2006 Location: My Very Own Trunk Monkey Posts: 906 My Photos: (0)	Mine did this but it seems to be only when I have the air on. Which was when I wanted to make sure that it worked. Afterall this is a convertible I don't need the a/c __________________ Chili Pepper Red #3060 3 Stainless Pedals 1 plastic foot rest Black Top/Leather Interior LSD 6 Disc Monsoon Flowmaster Dual Exhuast Redline Gauges Bullet Door Locks WERKS Stage II Turbo "FOUNDER OF CENTRAL OHIO CUSTOM KAPPAS"

06-05-2007, 01:38 PM	#15 (permalink)
e-sarge Member Join Date: Nov 2006 Location: Oshawa, ON Posts: 57 My Photos: (0)	AC might run even when AC light is off... Keep in mind also that most modern cars also run the air conditioning when you have selected any of the defrost settings on your climate control system (not the rear window defroster). In my experience, most of the brands do this to pre-dry the air they are blowing on the windshield (usually it is buried somewhere in the owner manual -- mine isn't handy at the moment), and most also do not turn on the indicator light to let you know that they've done it (it's kinda like a little secret). One sure way to turn off the AC is to turn the fan to the off (zero) position -- that will not necessarily stop the flow of air into the car, but it will certainly turn off the air conditioning system. Next time it happens, try turning the fan off to see if it goes away. __________________ 2007 Sky Red-Line, Midnight Blue, Black top, Spoiler, Ebony/Tan Leather, Opel GT Antenna View my page on ImSaturn A program is a device used to convert data into error messages.

06-21-2007, 06:24 AM	#17 (permalink)
redmansioner Member Join Date: Jun 2007 Posts: 2 My Photos: (0)	Mine has AC problems and my car have difficulties in starting.The clutch gear doesn't engage, my trusted mechanic pointed out the master cylinder has to be replaced.Good thing I found some good quality of the parts so I bought also a good quality saturn spark plug to get out of the stalling issue.

07-10-2007, 03:18 PM	#18 (permalink)
sharondean Member Join Date: Jul 2007 Posts: 1 My Photos: (0)	If I have read this right, Valistener you have a manual transmission. Mine is automatic and has recently started doing the same. I have noticed the last few times that my A/C was on. I turned off my A/C and it did not do this again but I was close to work so not sure if it will happen again this afternoon. I can't remember if it was on the first time it happened. I told my husband and he said I probably had just got some bad gas. Did you get yours fixed and what was the problem if so? I would like to print a copy of this for him. Thanks for the good info!!!

08-05-2007, 04:15 PM	#19 (permalink)
tazster2211 Senior Member Join Date: Apr 2007 Location: Bellevue, NE Posts: 142 My Photos: (0)	I think I had this happen to me last night. It was really hot out and I had the top down but was running the A/C. When I'd slow to a stop light with the clutch depressed, I would feel a slight shake/vibration from the engine and you could feel the shifter shake a little like it's trying to recover from idle. When I turned the A/C off, it didn't seem to do it anymore. Has anyone ever got this situation diagnosed by the mechanic?

08-09-2007, 07:54 PM	#20 (permalink)
RealGomer Member Join Date: Sep 2006 Posts: 57 My Photos: (0)	Have you tried depressing the clutch when slowing instead of keeping it engaged? Sorry, couldn't resist. After my A/C problems, I'm gettle a little goofy.

08-14-2007, 02:34 PM	#22 (permalink)
Boomer Senior Member Join Date: Aug 2007 Location: Pineville, NC - Sevierville, TN Posts: 171 My Photos: (0)	Somewhat new to the board, as well as new 07 Sky. However, I have indeed noticed that if the AC is on, the car is 'rougher' on the idle, when coming to a stop. 'Tis a stick, and not an automatic. Because I am lazy , can someone recap the issues they were having, and the resolution from previous posts? __________________ ßoomer 07 Sky- # 141904 White / Tan / Chrome 6 Mods and Counting! Whoot!! ßoomer's Domain Boomer@charlottedragoneez.com