My car stalls when I push in the clutch while decelerating

[Aandf1978]

Hmmm well that does kinda change things I guess, I thought it was doing it at idle as well. Well either way, maybe swapping the TB might show something, cause the TPS and the TB will be knocked out in one shot. I don't know hope you find something.

 

[Ampire]

I had a problem like this with my original canned diablosport tune. The car would stall with the AC on if I was in heavy traffic and doing a lot of 1st gear 2nd gear neutral 1st gear etc, every time I depressed the clutch pedal the engine would dip rpm from like 800 to 400 back to 800. If it was really bad the car would just stall. Only occured with the AC on. A custom tune solved the problem. It was an AC Idle parameter setting that was too low.

On another car, I had a similar issue but it would stall in neutral or in gear with clutch disengaged. That was a fuel injector problem, I also had a occasional cylinder misfire code with that issue.

My suggestion would be to take off the cai, put on the stock intake, and flash the tune to the original tune. If the problem sticks around, you know its not the tune.

Reasons I think it is the tune: you aren't having a CEL, and because there is a parameter on some tuners to adjust the idle setting under different conditions. Because the tune is so easy to diagnose, you should do this first. Its like 15 minutes of work.

I would expect most of the other issues to occur BOTH when the car is in neutral or when the car is in gear but with the clutch disengaged.

Also, does the switch on the clutch pedal only complete a circuit to start the car, or does it serve a dual purpose of also letting the ECU know to drop to the idle RPM?

I don't know this for sure however my suspicion is that it is both. There is a parameter for Idle Drive and Idle Neutral on the SCT tuner, I would guess it does the Idle Drive setting when the car is in gear but with clutch disengaged.

Someone correct me if I am wrong please!

 

[wabirch]

I'm not using my TB. It was on on 09 Bullitt for a couple of years, no problems. Be happy to loan it to you to isolate the trouble if you need it.

 

[Mr.]

Very informative post! Thank you for taking the time to write that. Once I verify that the things I have done haven't solved the problem, I will try swapping the stock intake/tune back in.

 

[Mr.]

I'm not using my TB. It was on on 09 Bullitt for a couple of years, no problems. Be happy to loan it to you to isolate the trouble if you need it.

Wow, thanks man! If everything else falls through, I will let you know.

 

[Mr.]

Just to update this thread - I cleaned the MAF the other day with CRC MAF cleaner, tested the PCV valve(it was good), disconnected the battery for more than 15 minutes, reset the idle again, and reloaded the 93 race tune. I havent been driving my car much, but so far no stalls. That's definately not to say that anything I've done so far has fixed it. I need to drive it more and keep trying to make it stall under the same conditions.

I also noticed how easily the PCV hose slips on and off the passenger side valve cover, so I'm going to put a hose clamp on it. I don't know if that will be a possible fix, but it can't hurt anything.

I wish I had more to say in this post, but that's all I got for now.

 

[lito]

I also noticed how easily the PCV hose slips on and off the passenger side valve cover, so I'm going to put a hose clamp on it. I don't know if that will be a possible fix, but it can't hurt anything.

Does the connector has the green lock broken or stuck in the open position? if right it won't come off.

 

[silver rhyno]

i had a problem just like yours on a fox body..push then clutch in and it died..traced it down to a bad ground...maybe this helps

 

[Mr.]

Does the connector has the green lock broken or stuck in the open position? if right it won't come off.

That's the drivers side. That one is locked. The one I was referring to was the hose that comes off the intake and into the passenger side valve cover. That one is loose as a DP loving whore. Can't remember how snug the OEM hose was on it, but it just seemed like it slips off too easily.

 

[Mr.]

i had a problem just like yours on a fox body..push then clutch in and it died..traced it down to a bad ground...maybe this helps

Thanks man, any info I get helps! I'll definately check out my grounds.

 

[NicD]

My 05 GT had the same issue. The stalling was only associated with a significant RPM drop the same way you're describing. Both times it was the throttle position sensor. Cleaning the sensor took care of the issue.

 

[Mr.]

My 05 GT had the same issue. The stalling was only associated with a significant RPM drop the same way you're describing. Both times it was the throttle position sensor. Cleaning the sensor took care of the issue.

How do you go about cleaning it?

 

[firefighterhill]

my money is on it being related to a dirty MAF. the TPS is on the throttle body opposite the side with the butterfly/blade electric motor.

 

[bigray327]

I battled this many times over the evolution of my car. In all cases, it was fixed by my tuner, after sufficient whining by me.

Tip: it's really easy to pop the clutch to restart, when this happens, since you usually have some decent speed going.

 

[ski]

How do you go about cleaning it?

It's a sealed unit, and cannot be cleaned.

 

[bullitt boy]

I have a stock 09 Bullitt throttle body complete with electronics. Switch them and try a test drive. I am in englishtown nj.

 

[Mr.]

my money is on it being related to a dirty MAF. the TPS is on the throttle body opposite the side with the butterfly/blade electric motor.

I cleaned it the other day, so after I drive the car around alittle more I will be able to see if this was the cause.

I battled this many times over the evolution of my car. In all cases, it was fixed by my tuner, after sufficient whining by me.

Tip: it's really easy to pop the clutch to restart, when this happens, since you usually have some decent speed going.

Yeah the tune might be the issue, but I'm going over all maintenance/mechanical things first. I figure even if nothing that I do actually fixes the problem, at least I'll end up with new or clean parts on my car that I won't have to worry about for some time. Thanks for the tip too. So far I've been able to just push in the clutch and turn the key to start it back up at speed.

It's a sealed unit, and cannot be cleaned.

LOL, that makes me really curious how he was able to clean his. I was searching various sources and a dirty/faulty TPS can cause my issues. So if the TPS isn't serviceable on our cars, then I will buy a new one just for peace of mind. Even if it's not bad now, it will be eventually.

I have a stock 09 Bullitt throttle body complete with electronics. Switch them and try a test drive. I am in englishtown nj.

Thanks man! I'm going to order a new throttle position sensor and see if that resolves my problem. If I begin to suspect it's the throttle actuator motor, then I will shoot you a PM to take you up on your offer. Very cool of you!

 

[firefighterhill]

If you have a tuner and a laptop you can check the TPS.

 

[bullitt boy]

Let me know when your ready.

 

[Shelbgt05]

Have you cleaned the MAF? If not try going to your local auto shop and get maf cleaner. Go clean it then do idle reset.