85 T-type problem

[turboclam]

While lightly revving the motor at cold idle (750-1850 rpm) , the factory boost gauge reads boost immediately and car wants to die. The more gas I give the more boost it will read until I get to 3/4 throttle boost then disappears and motor revs up fine. I just put the motor in recently and I think I have vacuum lines incorrect. I've looked at the Sticky hot air info but it's hard to see. I have a dual port wastegate. EGR eliminated. The car cruises ok when warmed up but I also have bad knock retard at 3/4 throttle. I don't here any pinging and this is under 10#s of boost. Fuel pressure seams good and I have a new Walbro 307. I am running an 87 ECM, coil pack, mass air, and a stock 87 chip. The car still had the same cold idle problem with the 85 ECM, mass air, and chip. I am planning to get a chip burned for my set up from Eric but the idle boost thing shouldn't be chip related. Any help would be appreciated. Thanks

 

[Squid4life]

I would definitely look at the vacuum lines as your issue at first. You should not be building boost while revving in park. Do you have a real boost gauge, or just the LED's in the dash?

Stupid question, but when you did the 87 ECM conversion did you add the MAT sensor?

How did you eliminate the EGR?

Post more info and we'll get 'er fixed!

PS, I'd trace my vac lines and tell you where they are routed, but I have a sinlgle line wastegate, and I am not so sure mine are routed correctly anyways!!!

 

[turboclam]

Thanks for the reply

I have a Lee Thompson intake with the EGR passages Hard Blocked. I do not have the MAT wired yet so I do have a code 23. But with the 85 ECM, mass air, 85 chip, the car acts worse. I have a vac/bst gauge and it shows 10lbs of vac at idle but as soon as I touch the gas it goes to 0. I really don't think I'm building boost but I'm wondering why the factory boost guage is reading boost during my trouble spotts. I can also unplug the MAP sensor and still get activity out of the factory boost LED. Thanks again.

 

[tim sewald]

vacuum lines

Calm, read this thread "what kind of chip". I had the exact same thing happen to me. I'd bet money thats your problem.

Tim

 

[Squid4life]

get it fixed yet turboclam?

 

[turboclam]

Problem Solved!!!

Squid, I got the original problem fixed. Bad cam sensor lid. I have more problems..... Headgasket and #2 wiped cam lobe, but it sure idles alot better. I'm ready for 30 lbs of boost on pump gas!!! Just breaking the tension barrier. Looking foward to hrs & hrs of wrenching bolts and scraping gasket material while wiping the blood off my knuckles. You know I have a 93 5.0 that for the past 5 years I have never even had to change a spark plug on her, but I need the love hate relationship drama I have with the Buick to balance out the universe. Thanks for asking about my 1st problem. Mike

 

[Squid4life]

Sounds like you are having my luck! I have a head gasket issue now, but fixed the voltage, vac line issue (I think), and fuel issue. Always something. And I have only had this car for 6 months, and have only driven it 114 miles! Got the car, pulle dmotor to clean and paint the motor, regasket, etc. The "Since it's out" disease hit me, so new race heads, cam, intake, headers, pipes, 87 ECM, etc, etc, etc.

Now, new motor, blew head gasket due to all the above issues. I hope to get it back together before some real bad Kansas weather hits.

Squid

PS, I had a 88 GT with no issues. Also have a 70 Torino I have had since I was 16. Ate 5 trannies, but motor is still together!