Weird Stalling Issue That Fixes When ECU is Cleared
#1
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2000 Cherokee Sport
I installed a 62mm throttle body from DWD the other day. Drove to work and home with no issues. Ran like a champ. The next day, it started stalling when I stopped at a light. Had to hot brake it back home.
Before I did the swap, I had an evap code that I fixed (new gas cap) and the light went out on its own for about a week. A day or two before the swap, the light came back on for a small leak. I smoke tested and found CCV breather hose has a crack. It ran fine, so I'm just waiting on a new one to come in the mail. I did the TB swap, all was fine (I didn't reset the ECU when I did it). Until the stalling. Got another code for purge flow with the small leak code. I checked the purge solenoid (which is about 4 months old) and it wasn't ticking. I got another one and it worked, but was still stalling. I then pulled the negative cable from the battery for about a minute and all of my stalling problems went away. I drove it all day yesterday, about 50 miles, without a hitch. This morning, on my way home from work, it started stalling again at lights. I pulled off into a parking lot and pulled the negative cable. Again, all is right with the world.
Anyone know what is up with this?
I should have mentioned that the first time it stalled, I was stopped in a parking lot and cut the when it the right. It was only stalling that way for a few minutes, then went on to stall whenever my foot was off the gas.
The IAC and TPS are about a month old and worked fine on my old TB (there was nothing wrong with it). Too bad it's on it's way back to DWD as a core. I did test the TPS with a multimeter and everything seems to be good with that. Also, I almost forgot, about 2 weeks ago, I installed the H4 harness from K Suspensions. I also tested the battery and alternator, no issues. The battery is also just a few months old.
I installed a 62mm throttle body from DWD the other day. Drove to work and home with no issues. Ran like a champ. The next day, it started stalling when I stopped at a light. Had to hot brake it back home.
Before I did the swap, I had an evap code that I fixed (new gas cap) and the light went out on its own for about a week. A day or two before the swap, the light came back on for a small leak. I smoke tested and found CCV breather hose has a crack. It ran fine, so I'm just waiting on a new one to come in the mail. I did the TB swap, all was fine (I didn't reset the ECU when I did it). Until the stalling. Got another code for purge flow with the small leak code. I checked the purge solenoid (which is about 4 months old) and it wasn't ticking. I got another one and it worked, but was still stalling. I then pulled the negative cable from the battery for about a minute and all of my stalling problems went away. I drove it all day yesterday, about 50 miles, without a hitch. This morning, on my way home from work, it started stalling again at lights. I pulled off into a parking lot and pulled the negative cable. Again, all is right with the world.
Anyone know what is up with this?
I should have mentioned that the first time it stalled, I was stopped in a parking lot and cut the when it the right. It was only stalling that way for a few minutes, then went on to stall whenever my foot was off the gas.
The IAC and TPS are about a month old and worked fine on my old TB (there was nothing wrong with it). Too bad it's on it's way back to DWD as a core. I did test the TPS with a multimeter and everything seems to be good with that. Also, I almost forgot, about 2 weeks ago, I installed the H4 harness from K Suspensions. I also tested the battery and alternator, no issues. The battery is also just a few months old.
Last edited by pearlheartgtr; 10-23-2019 at 03:22 PM.
#2
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
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I"m thinking that you either have a vacuum leak that shows up with temperature (in which case the ECU 'clearing isn't doing anything but allowing things to cool a bit), OR
You have confused the ECU with... possibly a vacuum leak or other airflow problem due to your TB installation.
You have confused the ECU with... possibly a vacuum leak or other airflow problem due to your TB installation.
#3
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I can let it sit and cool down for a couple of hours and it will still stall. When I reset the ECU, it was when the truck was at temperature and just running. The longest it got to sit, both times was about a minute or two.
#4
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Cheap Chinese IACS Strike Back!
As far as I can tell, the Chinese IAC I installed a month or so ago got stuck open. I ordered another cheapie from Amazon and installed it. Everything runs fine now. In a week or two, I'm going to spring for the Mopar IAC so this doesn't happen again. I also sprayed down the ECU connectors, there was a little bit of grunge in them.
So, so far, I've sovled the problem. Unless, something else pops up.
As far as I can tell, the Chinese IAC I installed a month or so ago got stuck open. I ordered another cheapie from Amazon and installed it. Everything runs fine now. In a week or two, I'm going to spring for the Mopar IAC so this doesn't happen again. I also sprayed down the ECU connectors, there was a little bit of grunge in them.
So, so far, I've sovled the problem. Unless, something else pops up.
#5
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
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There ya go. That's why we always say to stick with OEM on these parts. IAC, TPS, and all sensors.
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