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early FI 2.5 Wrangler, starts, idles, stalls when given gas

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Joined: 16 Apr 2006
Location: central ny

PostPosted: Fri Jan 26, 2007 6:24 pm    Post subject: early FI 2.5 Wrangler, starts, idles, stalls when given gas Reply with quote

I have a friend who changed the gastank on his early FI 2.5. 5 speed (first year of MOPAR take over) the old tank was a 15 gal and was replaced with an aftermarket 15 gal tank. The fule pump, filter and harnes from the original tank were retained and transferred. New gas was added, and the car was started. It started after about 30 to 45 seconds of cranking and idled fine while leak checks were done. When he tried to move the Jeep out of the work area it stalled when the gas pedal was pushed down. Jeep immediatly restarted and idled fine, but again stalled when tried to move. Immediatley restarted and idled fine, stalled again when given gas. Now will not re start. Gas is present spark is present at plugs.

I have suggested the following:

Assess fuel pressure and flow rate with ignition on.

Remove and clean TPS and idle air control motor.

Remove and clean throttle body.

Remove fule line from rail and tank and reverse pressureize with low pressure compressed air, to assure there is no blockage.

Install new spark plugs.

Clean injectors.

Any thing I missed? Is there a secondary fuel filter somewhere that may be clogged with debris from the old leaky tank or from the change over process. Is there a point where the lines may have become pinched and allow enough fuel for idle but not for open throttle operation, could debris have plugges something in the throttle body which would send a false signal which would prevent the FI from providing more fuel open throttle operation.

Lotsa stuff but don't wanna miss anything. By the way the friend is a service manager at the local mopar dealer, and his assistant has been fiddling with it with an old style code reader.

I would like to ace both of them and supply the answer. If not in the above items then what?????
If yer running a flathead, how come yer plugs are slanted
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Got Rev Limiter?
Got Rev Limiter?

Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Sat Jan 27, 2007 9:55 am    Post subject: Reply with quote

This is just a guess. It could have have been running from fuel left in the line. Maybe the pump is shot or disconnected in the tank. If it has an inline fuel filter, an easy way to check for fuel being sent is to pull the line off it and try to start the JEEP. If the pump is working correctly you will know. One of the first things you said was assess fuel pressure. Your first instinct is usually the right one!
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