post #1 of Old 01-22-2013, 12:52 PM Thread Starter
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Recently I've began to try and solve the issue of my comanche's rough idle. It has the 2.5l in it. Im getting about 15-16 mpg in. I know jeep isn't known for good fuel economy... But that low for a 4 banger?! I had a major vacuum leak at the bottom of the TBI where the block connects the 4 lines. I took the block out and fitted about 2 inches pieces of vacuum line for all 4 lines and voila, no more leak. I took it out to do some errands it still has somewhat of a rough idle. It definitely helped but when the truck is on and not moving the idle runs up and down in RPMs. Someone I work with told me the fuel injector could be clogged and said they should make a cone like spray onto the butterfly valve in the throttle body. When I checked mine it just sprays it in an unorganized burst onto the valve. Could I possibly need a new injector? I bought a refurb one 2 years ago to get the truck itself running because it didn't have one at all. But those 2.5 injectors are fairly expensive. I want to see what other simple things it could be before I fork over 125 bucks for one.

Last edited by colinkx250f; 01-22-2013 at 01:02 PM.
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post #2 of Old 01-23-2013, 06:43 AM
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1990 MJ Comanche 
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Intake manifold bolts tight?

BG44K in the fuel tank to clean that injector.

If you own a Renix Jeep, you'll want to check this out.

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post #3 of Old 01-23-2013, 08:27 AM Thread Starter
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Intake manifold is tightened down. I had to put a gasket in for it about a month ago
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