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#4416 of 5143 Exhaust fumes/check engine light in my 1997 Jeep Grand Cherokee Limited
Mar 16, 2009 (6:04 pm)
I need some advice. I just bought a used 97 Jeep Grand Cherokee Limited a week ago. Its been running fine but when I bought it I was told the exhaust manifold was cracked and the VIC said "coolant sensor bad". I took it in for an oil change and to replace the sensor and replace the serpentine belt. The mechanic told me the sensor was fine, but it was running too cool so probably a bad thermostat. Turns out there was no thermostat in the jeep at all and the housing was in bad shape. So they installed a thermostat and a new housing. Now it runs rough, the "service engine" light came on. I took it back and they told me it may take 3 cycles of running for the computer to reset itself with the proper levels. I drove it around for a while and now I have bad exhaust fumes inside! Especially when I run the A/C. I know I have a crack in the exhaust manifold but I didn't have the fumes before todays fix. Any ideas what could be causing this all of a sudden? I know mechanics hate it when you tell them "It didn't do this before"...but it didn't! Any ideas would be much appreciated.
#4417 of 5143 Re: Exhaust fumes/check engine light in my 1997 Jeep Grand Cherokee Limited [newtojeeps]
Mar 17, 2009 (2:30 pm)
Ok...so you replaced the thermostat and now the system is probably working like its supposed to...now that the coolant is being regulated the ECT(engine coolant temp)sensor is finally noticing that the coolant is either getting warm/not getting warm and is sending that information to the ECM(engine computer) telling it "WHOA!! Its not running rich/lean enough!!! ADJUST! ADJUST!). I'm thinking that now your mixture is running too rich and thats why you are smelling fumes...through the LOVELY cracked manifold. What makes matters worse is that with that crack, the manifold can suck in oxygen, thus leaning out the mixture at the O2 sensor and tricking the ECM into thinking you're running too lean at the injectors...ergo, too much fuel and a really nasty odor. It can also cause your catalytic converter to start loading up and deteriorating. This is what I'd tell your technician. Its like the snake that eats its tail. If you need me, send me an email at brianjoe69yahoo.com. I'll help you more if need be.
#4418 of 5143 Re: 1998 JGC front end squeaking and noisy transmission [trek87]
Mar 18, 2009 (4:07 pm)
just a long overdue update in case anyone searches and finds this thread...the squeaking was my serpentine belt. it turns out my belt tensioner was worn out and had to be replaced. the squeaking was due to improper belt tension. a simple repair.
went ahead and replaced all 4 shocks and man, what a pleasant improvement on all-around ride and handling (esp. on turns - not nearly as much lean). well worth $40/mopar shock.
#4419 of 5143 Re: 1998 JGC front end squeaking and noisy transmission [trek87]
Mar 18, 2009 (6:21 pm)
Aint it great when your efforts have great results? Hooray --- Clip
#4420 of 5143 Re: 1998 JGC front end squeaking and noisy transmission [trek87]
Mar 25, 2009 (3:34 pm)
is that $40 for the set or $40 per shock?
#4421 of 5143 Re: 1998 JGC front end squeaking and noisy transmission [mtbventana]
Mar 25, 2009 (5:15 pm)
#4422 of 5143 1995 jgc chugging
Mar 27, 2009 (1:30 pm)
ok i have Just Emptied Every Pocket (jeep) replaced ccps,tps,radiator, put electric fan on, new power steering pump, new hoses,new water pump, new transmission, new fuel filter, Spark plugs,cap, rotor button, electonic pick up under rotor button
now my question is when i drive normal it is fine but as soon as i try to pass it starts chugging like i'm going on and off with the throttle. Also does it in park idling and throw the throttle to it full and it does it just like before what could this be? fuel press. reg.?
fuel injectors, electrical, cat conv? Got any ideas. Please help its our only vehicle
#4423 of 5143 Re: 1995 jgc chugging [axe101x]
Mar 27, 2009 (1:47 pm)
I had this issue. Mine would chug like this when passing and eventually when I was just driving down the road normally. It was the o2 sensor. I think the part was the upstream sensor, located before the cat/converter. The part was around $70. Go to a autoparts store and use their computer code reader. You should be able to pick up an error code if the sensor is bad.
The chuggin freaked me out and I'm so happy it's gone.
Mar 27, 2009 (1:50 pm)
there is no check engine lightr on and it doesnt come on when chugging anything else
#4425 of 5143 Re: rep [axe101x]
Mar 27, 2009 (3:18 pm)
Maybe too rudamentery, but have you replaced the fuel filter? Also, if you have access to a fuel pressure gauge, you might get some clues there. The reading should be constant even when you rev the engine. If not, you might have a tired fuel pump, clogged filter, or dripping (leaky) injector seals.
Good luck --- Clip