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95 chevy Z-71 no power done a complete tune up still no power acts like a carb engine warming up

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Have you done a compression test ?, checked timing ? Changed fuel filter, ran pressure test on fuel system ?

Posted on Feb 04, 2010

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As to the 1990 Jeep YJ I asked about,engine is running, starts and idles fine. When you try to accelerate, acts sluggish until engine starts to warm up, then runs normal. Have changed the temp sensor.


Have you done a complete tune up ? To include replacing the fuel filter ? Are you the original owner of this Jeep ? If no, may have worn engine cylinders, piston rings, or bad valves. Many things could cause this problem.

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The idle is computer controlled. Have a look for any disconnected/split vacuum hoses allowing unmetered air to enter the engine which will cause a high idle. Have a look inside the throttle plate and inspect for dirty/black. If so, clean with a carb spray and toothbrush. This can affect idle if the plate is sticky. You may also have a sticky idle air control motor causing this issue

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when was the last tune up done on it? have you checked the spark plugs and firing order to make sure it is correct?

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Wow, quite an undertaking. I had an '81 El Camino and wish I had never sold it. Originally it had a 267 c.i. V-8 with a Rochester 2bbl carb. I put in a Chevy 350 4-bolt main crate engine, Edelbrock intake and carb, and Hedmann headers (it ran like a scalded dog LOL). My advice is to look for a Haynes manual covering the '71 model year. They have complete wiring diagrams in their manuals, but the wire routing will be up to you. Good luck.

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1 Answer

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I suggest a second opinion would be in order as everything he did for the tune up was not altogether necessary. I consider that as the car was running ok before I would not touch the carby other than to fine tune the idle mixture to emission requirements. Any problems with the distributor cap would have showed up as a miss and the rotor button would have to be really bad but again as it was running ok. My policy is don't touch what ain't broke.Power valves in carbys are there to give extra fuel when the vacuum falls off under acceleration and do nothing else. To accommodate a bigger alternator more adjustment on the idle mixture screw would be necessary at idle but as alternator barely charge at idle the adjustment would be little. The low compressions may be from pumped up hydraulic followers and I would discuss that with the original engine builder as to what hydraulic units he fitted. but again if it was running ok before what the hell. Yes get a second opinion for sure from the engine builder.

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1 Answer

I have a 2003 chevy tahoe 71 with 97,000 miles,that cranks won't


place fuel pressure gauge on fuel rail at designated location and chek press. this will eliminate f p , also check relay and fuses labeled "crank " let me know

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give a good tune up. if it still is acting up let me know

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Have you checked fuel pressure? You said TBI so it needs to be around 11-12-13 psi

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It sounds like your EGR Valve has Carbon deposit. I am gussing you have done a tune up and there are no check engine lights on. Just remove the EGR valve and clean it with carb creaner or injector cleaner. It's a common thing with the 92-95 votec . Good luck

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Check for vacume leaks. Hoses and around intake gaskets.spray some carb cleaner around intake gaskets.

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