4.0ohv lope/misfire at idle.. CEL - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 06-05-2009
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4.0ohv lope/misfire at idle.. CEL

Hey guys, I have a 92 with a 4.0..5 speed. 245km on it. Everything seems to be pretty good with it in general, and I have just replaced the flywheel, top end gaskets, plugs and wires. I have also cleaned the MAF and IACV (I believe it is..on the drivers side of the IM)

There seems to be a misfire coming from 5-6 or something but it's only on idle. The truck still has lots of power and fuel economy doesn't really to be affected which is kind of a relative statement for a 4.0, and the only real time the CEL will show up is when I hammer on it getting onto a highway (then when i come to a stop the misfire will be terrible), if i keep the revs below 3000 or so rpm I never get a CEL.

Any ideas?

Also, the tach doesn't work below 3000rpm. Once i start getting past 3000rpm, the tach will slowly climb and begin working again. Seems like it would be a ground issue?

Could it maybe be something jiggered up with my coil pack?
Thanks for any ideas guys
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Old 06-10-2009
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any ideas? i usually get a check engine light around 100 km/h now..and it's starting to stay on more consistantly..been thinking maybe a pcv valve or something? hrmm
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Old 06-10-2009
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Read the code.
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Old 06-10-2009
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Quote:
Originally Posted by Blhde View Post
Read the code.
x2

94 and earlier Rangers with OBD can be read with an analog voltmeter or test light. Or you can use a code reader labled for OBD or OBDI (not OBDII only).

OBD trouble codes and code reading info
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Old 06-10-2009
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Ahh..forgot to mention. I guess its whats called a "soft code" it goes away once you turn the truck off and turn it back on. Will I still be able to get the code if the truck is running?
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