Problems at WOT FIXED!!

PhatMpk · November 05, 2009, 12:43:39 AM

Hi all Ok so here is what I have done so far, ohmed outed the injectors and they read 12.1. I have put a new fuel pressure regulator, new fuel pump, new fuel filter, AcDelco 02 sensor, replaced two bad injectors that read 9.7, scanned the computer with no error codes, replaced spark plugs with bosch supergold, new wire set, new pcv, crossover patched, new wheel bearing hubs, Non-abs brake system, fixed all the vacuum leaks in the harness, seems like the car doesnt want to shift without letting off the gas, also at high speeds at WOT the car seems to lose power, If i let off the gas it seems to pick up more speed, or if i ease into the throttle it still struggles to pick up speed

flybynite · November 05, 2009, 05:23:37 AM

Bosch plugs could be the problem, These cars really like the stock plugs. BTW what is the gap on the plugs..

PhatMpk · November 05, 2009, 02:19:32 PM

First try around
I gapped all 6 to .45, then went back and only got to changing the front 3 plugs to .30 the back three plugs are at .45, i rearranged the order of the fuel injectors so that the stock three injectors are on the front and one gpsorresen injector one yellow top and one stock injector on the back three, fuel pressure gauge is at 42 lbs while starting and while running has 34 lbs of pressure and it rises to about 44 when revin it up

mfewtrail · November 05, 2009, 06:12:36 PM

Are you still running those larger injectors that you mentioned in your thread over at the w-body board?

dogginred90 · November 05, 2009, 06:13:34 PM

Gap those back 3 to .30 please. Trust me, I had that issue for 1 year till someone told me to gap them to .30. My car had the same issue and once they were gapped right the car ran great till I had a weak coil. Good luck and about your tranny shifting weird. Do you have a check valve "T" at the modulator valve?

GOT2B GM · November 06, 2009, 07:15:41 AM

.028 - .030 is a good gap range

PhatMpk · November 06, 2009, 11:24:54 AM

No I sold the 24 lbs vemons but my stock ones back in it, just cant afford a chip right now tryn to save for the yellowtops, there is no check valve on the trans vac mod, ill try to gap the back three maybe later today and see what happens, thanks guys

killinprixs · November 06, 2009, 12:16:06 PM

someone please get him a pic of the check valve and what way it gets hooked up.... you're boosting the transmission vacuum modulator, that is why it doesnt want to shift, it needs vacuum to shift.

Prospeeder · November 06, 2009, 03:30:39 PM

Not only do these cars not like other plugs, they freaking HATE bosch plugs, those things are the biggest POS plugs. Toss them in the trash and get some AC delcos, even rapidfires if you seem to think you must have somthing other than stock

TGP Nick · November 06, 2009, 07:24:46 PM

Should look just like this:

For what it's worth, I'm having the exact same runability problem with my TGP and haven't been able to figure it out

dogginred90 · November 06, 2009, 09:38:55 PM

You can also try different coils. I had one that had weak spark and at WOT it would hestitate, changed a coil and all is well.

PhatMpk · November 06, 2009, 10:45:24 PM

I regapped the back three plugs runs a little bit better but still the same symptoms mostly

PhatMpk · November 06, 2009, 10:47:40 PM

definitely think that the vacuum line from the TB to my trans vac modulator doesnt have that valve there also cruise control crapped out on me about a year ago

dogginred90 · November 07, 2009, 09:02:31 AM

If you dont have that "T" go to your local parts store and get one. It is in the HELP section. (it should be the only check T there). Larger port is the one u should leave open. Just lok at Nicks pic, he knows about this little bugger pretty well. Next adjust your TV cable at the back of the intake. Push the square buton and psh the cable back in. Then go inside and push the gas pedal slowly the whole way to the floor. You should hear a clicking sound(that will let u know it is adjusting. Next lets move on to the dying issue. I am still thinking weak coil, but lets clean the IAC sensor. Is your TPS adjustable? If so make sure your screw head is centered with the slot. UMMM also what kind of wires you have(NEW or OLD)? TGP's eat wires for breakfast LOL. Like everyone will tell you GO AC DELCO for plugs and OEM for coils. Trust them they know what they are saying. I fought this for a long time and finally took their advice and am enjoying it(besides my tranny is junk). GOOD LUCK and keep us updated.
Shawn

TGP Nick · November 07, 2009, 11:28:13 AM

That little check valve for the transmission is HELP! #47150 by the way. I'd grab a couple, as I've gone through a few between them breaking, melting, etc.. there is another check valve just like this by your cruise control that gets close to the exhaust and may melt... I've encountered that issue as well on other GPs, turbo and n/a.