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Car Forum / Chevrolet / Chevrolet Trucks / June 20071994 k1500 5.7 ltr --- loss of power
Any way I have a 1994 Chevy Blazer 5.7 ltr All of a sudden I have loss of power. Poor acceleration. truck start fine This I have checked and replaced Replaced Spark plugs and wires fuel filter Checked timing is set to specifications - ok vacuum leak check with carb cleaner around base of throttle body - ok vacuum was 21psi at idle and increased to 25 psi when accelerated checked coil continuity per Haynes repair manual - ok Is there a way to check if catalytic converter is clogged? I thought the vacuum test would show that Maybe fuel pump? > Any way I have a 1994 Chevy Blazer 5.7 ltr > [quoted text clipped - 18 lines] > the vacuum test would show that > Maybe fuel pump? Also I did compression test all pistons are roughly 150-160 psi > Any way I have a 1994 Chevy Blazer 5.7 ltr > [quoted text clipped - 18 lines] > the vacuum test would show that > Maybe fuel pump? Worn injectors? I replaced mine at 100K, truck had more pep. For the Cat I had made a fitting that replaced teh EGR valve. Drove around and watched the pressure guage to see if the cat was clogged. Wound up replacing it anyway once it started to rattle. Cheers > > Any way I have a 1994 Chevy Blazer 5.7 ltr > [quoted text clipped - 14 lines] > > vacuum was 21psi at idle and increased to 25 psi when accelerated > > checked coil continuity per Haynes repair manual - ok That would have to be last resort. The loss of power is very significant. Not minor > > Is there a way to check if catalytic converter is clogged? I thought > > the vacuum test would show that [quoted text clipped - 9 lines] > > - Show quoted text - >That would have to be last resort. The loss of power is very >significant. Not minor Is it okay when it first starts up ad runs and then gets worse or is it constant? ----------------- TheSnoMan.com Loss of power is still present... I replaced O2 Sensor and gutted catalytic converter. Does anyone know where the EST connector is for timing. It is not located near the black cover on the passenger side like my book indicates? Would fuel pump cause loss of power? > On Mon, 04 Jun 2007 17:11:01 -0700, Neoinbiz > [quoted text clipped - 6 lines] > ----------------- > TheSnoMan.com >Loss of power is still present... > >I replaced O2 Sensor and gutted catalytic converter. Gutting the converter kinda hurts more than it helps unless it is plugged but that is kinda rare. >Does anyone know where the EST connector is for timing. It is not >located near the black cover on the passenger side like my book >indicates? If the kncik control is in a fail mode it would keep spark "dialed back" all the time and reduce performance a lot. TIme temporaily advanicing timing to 6 or 8 BTC and see how it runs. >Would fuel pump cause loss of power? It could if the engine is leaning out under load from low fuel pressure. ----------------- TheSnoMan.com If the catalytic is clogged, that should affect highway speeds. Try a couple gals of premium gasoline, and some STP fuel cleaner stuff. That's cheap, relative to a fuel pump. Also, don't ever let your gas tank go dry. Fuel pumps in the tank are cooled by the gasoline (scarry thought). Did you get a Haynes or Chilton book for the truck? That's got some troubleshooting tips. Vacuum is measured in inches of mercury, not PSI.  SignatureChristopher A. Young You can't shout down a troll. You have to starve them. . : Any way I have a 1994 Chevy Blazer 5.7 ltr : [quoted text clipped - 18 lines] : the vacuum test would show that : Maybe fuel pump? > Any way I have a 1994 Chevy Blazer 5.7 ltr > [quoted text clipped - 18 lines] > the vacuum test would show that > Maybe fuel pump? hey I have the same symptoms on my 95 tahoe, i was hoping you may have figured out what the cause was by now, i had a diagnostics down and i was told i had idle air control problem and fuel pump relay or circuit fault. but I'm not sure where to go from here was hoping you could give me some insight or point me in the right direction. if so email me back at my email its ellyjn@msn.com, i'd appreciate any help i can get thanks Elly |
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