frustrated
#1
frustrated
91 z28 conv. started loosing power over a few months, now it's very hard to start, it backfires occasionally through the tpi intake. have replaced fuel pump, filters, injectors, egr, plugs, checked plug wires, checked the distributer, tried a new computer, checked the timing chain and timing, checked for a plug exhaust, and all vacuum lines and volume. had a tech check for any problems and he said that the car should run. if i get it started it has no power, like it's starving for fuel or is out of time. the timing is ok and the fuel pressure is where it needs to be. have check the lift of the valves and they appear to be opening far enough via visual inspection.
any ideas????
frankc
any ideas????
frankc
#3
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Join Date: Apr 2006
Location: Pgh PA
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Car: 89 5.7 IROC/95 LT1 Corvette
Engine: All 5.7's
Transmission: 700R4 (Roessler)/ZF6
Axle/Gears: 10 bolt Zexel 3.23's. CTW 17" wheel
Re: frustrated
Check your air filter and your cat. Is your check engine light on?
#6
Re: frustrated
91 z28 conv. started loosing power over a few months, now it's very hard to start, it backfires occasionally through the tpi intake. have replaced fuel pump, filters, injectors, egr, plugs, checked plug wires, checked the distributer, tried a new computer, checked the timing chain and timing, checked for a plug exhaust, and all vacuum lines and volume. had a tech check for any problems and he said that the car should run. if i get it started it has no power, like it's starving for fuel or is out of time. the timing is ok and the fuel pressure is where it needs to be. have check the lift of the valves and they appear to be opening far enough via visual inspection.
any ideas????
frankc
any ideas????
frankc
#7
Re: frustrated
I RECHECKED THE DISTRIBUTER, ALL PARTS CHECKED OUT OK. REPLACED THE PLUG WIRES, AND RESET THE TIMING. IT STARTS EASIER AND RUNS BETTER THEN IT DID BEFORE, BUT IT STILL DIES OUT, BUT DOESN'T STALL, AND STILL POPS BACK THROUGH THE INTAKE. WHY THE BIG HESITATION AND POPPING BACK??? NO CHECK ENGINE LIGHTS... AND THANKS FOR THE INFO, EVEN TOUGH THE OLD WIRES CHECKED OUT OK I CAN BELIEVE THE BIG DIFFERENCE IN THE IDLING AND REVVING. HOPE YOU HAVE THE OTHER ANSWERS I NEED, THANKS AGAIN.
FRANKC
FRANKC
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#9
Re: frustrated
IT POP BACK AND HESITATES WHETHER HOT OR COLD. QUESTION I'M GOING OVER THE CHILTON'S BOOK, AGAIN, AND IT MENTIONS A MEM-CAL., WHAT IS IT AND WHERE IS IT? PG 2-27.
#11
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Join Date: Nov 2008
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Car: 1991 Black Z28 G92
Engine: 350 for now
Transmission: wc t5
Axle/Gears: factory 3:42
Re: frustrated
backfire through the intake sounds like a timing issue to me. I would take the dizzy out bring the engine to TDC then put the dizzy back in pointing towards the #1 and set the timing from there. Every car I have worked on that involved backfire through the intake was timing issues.
#12
Supreme Member
Re: frustrated
The GM Tech that looked at it. Did he check Block Learn for signs of a lean condition? Did he compare ECM timing to actual timing? These are things that a GM drivability tech would check and they will most certainly reveal your trouble whether it's in a controlled device, such as injectors, a mechanical device such as the timing chain or distributor drive gear, or the Memcal.
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