Surging issue - please help -
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post #1 of 5 Old 12-11-2019, 07:48 PM Thread Starter
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Surging issue - please help

I have a 1995 Grand Zj 5.2 and after warming up the engine surges then stalls.
I’ve replaced
-fuel and air filter
-sepentine belt
-tensioner and idler pulley
-coolant temperature sender
I’ve had the Jeep hooked up to a fuel pressure gauge and it checked out ok. I also had it hooked up when it was surging and the pressure stayed the same. I’ve cleaned out the throttle body and replaced all the sensors in it last summer. I replaced the cap and rotor last summer too. It starts up very good but has had a low idle and bad mileage ever since I got it 5 years ago. The battery clamps were cleaned but they are kinda beat up. I got code 41 but that went away when I got a new battery...

Any ideas??

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post #2 of 5 Old 12-12-2019, 05:36 AM
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Did you replace the IAC and if so with what brand?
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post #3 of 5 Old 12-12-2019, 07:39 AM
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Posts: 6,951
check for vacuum leaks.

Always post fuel PSI if you have it -

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 5 Old 12-12-2019, 12:16 PM Thread Starter
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I replaced the IAC. Not sure what brand but one thing I didn’t mention was that there is an oil leak that’s smoking and I think it’s the valve cover gasket as it’s quite wet with oil. Maybe a vacuum leak?
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post #5 of 5 Old 12-12-2019, 05:02 PM Thread Starter
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My fuel PSI when running was 40. Approx 37 with engine off.
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