backfire and bogging down

Started by dogginred90, December 26, 2007, 08:15:32 PM

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GOT2B GM

What about a worn cam lobe? I know that has been an issue with a few TGP's....


Matt Shantz - 1990 Pontiac Turbo Grand Prix COLD A/C 80K mi, KAZ Hot Tuned, Birchtrax'ed +  a few mods  ......... 14.6829 @ 95.11 mph

grinders_18

I was sure I read somewhere that the Trans Modulator Valves are NOT adjustable?

This radio station was renamed Krenzy in honor of the last American hero to whom speed means freedom of the soul. The question is not when he's gonna stop, but who is gonna stop him.

R Dubya

It is possible it has a bad cam lobe, mine did, but it also ran like shit, wouldn't idle, forget putting it under boost, it would barely run down the road.  When it would accelerate, it was missing hard, and the boost was blowing the K&N oil under the hood as it came back out. 

IMO the bosch sensors are junk, take it back and tell them its throwing a code, and use the credit for a Delco one. 

You could check rocker arm movement if you are concerned about the cam. 

The stock valve is not adjustable but can be replaced with an adjustable one.  That crossover is more than likely your problem, but it's hard to diagnose from here.  Good luck with it.
Ryan Warren
'89 TGP
It doesn't run anymore.

dogginred90

Well here is an update I drove it today it idles great. Next issue the car builds between 5 to 10 lbs of boost and doesnt go anywhere and backfires let off gas lower boost and she starts to run better again until it builds boost. Oh and now my radiator kicked the bucket finally 2 gallons oh man I cant get ahead thats not really a problem finding one will be. Hope this info can help figure this thing out. I am getting frustated with it now.
                                      Thanks guys for your help.

grinders_18

OUCH! Sorry about the radiator as there are NO aftermarket radiators for our cars, and you can't find one unless it's off of a TGP itself. Hopefully it can be recored at a nearby shop for a decent price.

I'd suggest crossover pipe, as many others have already.

This radio station was renamed Krenzy in honor of the last American hero to whom speed means freedom of the soul. The question is not when he's gonna stop, but who is gonna stop him.

R Dubya

its probably a combination of things, could be fuel pump, injectors, something electrical.  The pipe needs replacing though, but be prepared to fix other things as well.

Ryan Warren
'89 TGP
It doesn't run anymore.

dogginred90

Well injectors and fuel pump are new pressure is 44 and holds good so I think it is the crossover and possible bad TPS. Changing O2 sensor once i get one from dealer.