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Unread 10-28-2012, 04:22 PM   #1
gam191982
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Join Date: Oct 2012
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Please help im lost

91 cherokee 4.0. My jeep has been acting really strange. Some days it drives great other days horrible. Idle is rough 80% of the time when I stop at a red light it feels like its choking and wants to die. When I hit the gas I get a lot of jerking and vibration, but sometimes it drives as if it was new. I already changed fuel filter and checked vacuum lines, new battery. One problem I did find was with my exhaust. it was done about 1year ago they said the converter was good so they did from the muffler to the tailpipe. They over streched the muffler side over the converter and air is just flowing out between the 2 sections. I went to auto store they sold me some stuff to put on it to seal it, right now its drying. I didnt realize the exhaust problem earlier because I havent drove it since i got the exhaust done.
Is this vibration and jerking due to the exhaust problem I found or is it worse. Any advice I'd really apprecitate. Thank you.

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Unread 10-28-2012, 04:27 PM   #2
gam191982
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O and somebody told me to go turn my key 3 times and I would get codes of problems. I did that today and I got a 12 (battery disconnect which I just put a new one in) 33 (a/c clutch relay or short circut but i dont care about a/c) 15 (speed sensor, speed odometer doesnt work plan on doing that later)
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Unread 10-28-2012, 04:57 PM   #3
WhyJayPA
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1988 YJ Wrangler 
 
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Sounds like an alternator going bad. While the jeep is running pull off the negative battery terminal and see what happens. If the jeep dies then your alternator is bad.
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Unread 10-29-2012, 09:56 PM   #4
Pitbull330
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1997 ZJ 
 
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Quote:
Originally Posted by WhyJayPA
Sounds like an alternator going bad. While the jeep is running pull off the negative battery terminal and see what happens. If the jeep dies then your alternator is bad.
That is not true. Does not sound like a alternator problem. Check ur fuel pressure. Should be at 55 psi. Check ur plugs and wires. When is the last time it had a tune up. Make sure u dont have leak down in an injector. Make sure ur map and maf sensors r clean. Along with ur iac (idle air control). Check all ur body grounds. Wiring is very important. Ur have any questions. Just pm me
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Unread 10-30-2012, 11:40 AM   #5
rjbruzan
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Start with a solid tuneup. Plugs,wires,cap and rotor. Then see how it runs. Buy good wires as cheap will only go bad quickly.
You cant diagnose other problems until the basics are in good shape.

Ron
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Unread 10-30-2012, 11:57 AM   #6
55hangman
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Is the air filter clogged nobody has mentioned it, your engine will get hard to start and run like crap il admit its gotten me in the past
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Unread 10-31-2012, 05:15 PM   #7
Pitbull330
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Any luck yet
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Unread 11-02-2012, 08:53 PM   #8
Pitbull330
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Pm'd
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Unread 11-02-2012, 10:41 PM   #9
fitzp20102
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I'm with Pitbull. Sounds like some common tune up issues. OR if the problem is hit or miss, that commonly will get you to a dying fuel pump. Is it rough to start, as in it takes a few seconds of cranking before it finally fires up? If the fuel pump is going, it takes longer to get the fuel pressure built up during startup, and then gives poor delivery throughout... But always start with the plugs, wires, and wile you're doing plugs it's easy to quickly check your cylinder pressure.
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Unread 11-03-2012, 12:00 AM   #10
Pitbull330
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Quote:
Originally Posted by fitzp20102
I'm with Pitbull. Sounds like some common tune up issues. OR if the problem is hit or miss, that commonly will get you to a dying fuel pump. Is it rough to start, as in it takes a few seconds of cranking before it finally fires up? If the fuel pump is going, it takes longer to get the fuel pressure built up during startup, and then gives poor delivery throughout... But always start with the plugs, wires, and wile you're doing plugs it's easy to quickly check your cylinder pressure.
Very well stated. I don't believe I mentioned a compression test. Good job. thanks. If u do a compression test each cylinder should be around 130-150psi.
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Unread 11-03-2012, 09:16 AM   #11
rjbruzan
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If if wont start take a hair dryer and dry the cap,coil and plug wires. This will dry them and let the spark get to the pluds instead of going to ground.

Ron
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