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88 2.5li won't go!!


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was running fine...then slowly, acceleration in 2nd gear would lag and start to backfire under heavy acceleration. then, progressively in 3rd, and finally all gears. before i could accelerate slow and had no problem, but after 10 or so miles it got worse. any ideas? i couldnt find any vaccuum leaks, and that's about as far as i've gotten.

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fuel pump failure, distributor isn't indexed properly and timing is off, perhaps a failing CPS

 

maybe dirty injector or the filter is already clogged....unlikely though with those symptoms

 

that's all I can think of.

 

basically, a bad fuel pump which still puts out less than max PSI would work fine at lower RPM's, but when you got to running higher RPM's where more pressure is needed to fuel it faster, it cannot match the necessary output for your engine's needs.

 

dizzy indexed properly...it may be off by one tooth. this could explain poor running and no acceleration...my 87 MJ with a 4.0 had the distributor off by one tooth, and it would idle PERFECT but you couldn't rev it above 1200 RPM..., where it would begin to pop and backfire...it would run up to around 1800 RPM then just kill itself.

 

failing CPS would read poor signals and not keep up with the timing and therefor not spark at the necessary moments...subsequently, if your flywheel is missing any of the timing teeth, you will net the same result (bad flywheel = pull tranny)

 

my bet is my second scenario is correct. did you do any dizzy work recently, or has it been done recently?

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nope, no work done recently. i have been driving it harder lately. instead of the average 8mi a day, i've been throwing some 100 mi and 65mph trips into it.

funny, before i bought it (like 3 months ago) i test drove it, everything worked great. a/c, signals, no smoke, no leaks. nothing. within 2 weeks the alternator, upper radiator hose, thermo, and a/c comp all crapped out. but what do you expect from a $500 buy. body's straight, interiors straight, was running strong.

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