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89 GP 2.8 missing badly


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Posted

In park the car sounds terrible until 2500 rpms, then sounds normal all the way up through the rpm range. A couple of my friends think its lost compression (240k miles on engine). Replaced plugs / wires already. Went to 10W 40 oil to try and compensate.

 

Any other ideas?

Posted

The older 2.8 and 3.1 engines are known for dead/nearly dead injectors...

 

Pull the upper plenum off and ohm out the injectors...you should see all of them at or near 13-16 ohms...I've seen bad ones short out (0 ohms) or damn near open (20K+ ohms)

 

compression loss is also a possibility, and easy to test for...

 

good luck

 

Regards, James

Posted

My 88 2.8 always got the IAC funked up.. cleaned it like twice a year.. lol.

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