run away idle
06-27-2011, 12:13 AM
#1
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Location: Mesa AZ
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Year: 1991
Model: Cherokee
Engine: 4.0l
wot on startup
I just replaced the head gasket and cylinder head on my 91 xj 4.0. when i start the engine now it races right up to 6000 rpms and has to be shut off immediately. it acts like the throttle is stuck wide open but it is not. i have tested the tps and it tests good. any ideas?
Last edited by harleyal68; 06-27-2011 at 10:32 PM. Reason: clarity
07-04-2011, 02:56 PM
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Year: 1991
Model: Cherokee
Engine: 4.0l
fixed it
upon furthur inspection i found that the bottom of the intake manifold was hung up on something and so there was a rather large air leak. seated manifold correctly and idles perfectly fine now.
07-04-2011, 03:41 PM
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Year: 1991
Model: Cherokee
Engine: 4.0l
cracks in cylinder head combustion chamber from previous over heating. replaced most of the cooling system and still runs hot and over heats on the highway(65+ mph) but will idle all day in 115 degree day without overheating. just have to baby it until the cooler weather gets here i guess.
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