rough idle, sounds like its missfiring

[603Redneck]

got an 88 2.5, finally got it started (the power wire going to the starter was bare at the end and shorting against the block, fixed that and she fired right up) but now its back to its original problem of rough idle and it sounds like its missfiring. when i give it full throttle it bogs down severely but if i ease into the throttle it will gain rpm's but still sound like its missing. its so bad that i can't even drive it. any ideas?

[chicofuentes0224]

Did you check all your ground wires?

Battery to block, block to back of head, and head to firewall. If they're old, replace em.

Oh wait you have a 2.5 so I'm not sure where the locations are, but check your grounds anyway.

[mvusse]

Low fuel pressure?

[603Redneck]

checked the grounds, they look fine. my buddy brought over a fuel pressure test gauge but theres no schrader valve on the fuel rail so i don't know how to test it

[BLHTAZ]

Sounds like a timing issue to me. The 2.5L engine (unlike the 4.0L) has a tensioner on the chain that does wear out and cause this type of issue. Could also be distributor related.

[603Redneck]

i replaced the dist with a used one off another motor, didnt seem to be an issue.

timing is set dead balls on. changed the dist, cap, rotor, coil, plugs and wires, crank sensor, tps, alt, battery....

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[603Redneck]

just an update:

so i got to thinking about it and realalized that it sounded like a fuel issue. sure enough it was. i held it wide open and poured gas down the tbi and she revved up like normal, but as soon as the gas burnt off it bogged down and died again. ill be replacing the fuel pump tomorrow so ill keep this updated

[603Redneck]

yup, it was the fuel pump! shes running like a top again!!!!!

[BLHTAZ]

:thumbsup: Glad you got it going. Guess this thread just kid of got lost for a while...