Need help please
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TGO Supporter
Joined: Oct 1999
Posts: 270
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From: Phila. suburbs, PA, USA
Car: Pontiac Grand Prix GTP
Engine: 3.8L V6 SuperCharged
Need help please
I posted this in exhaust at first but I guess it kinda morphed into a tech/general engine question.
https://www.thirdgen.org/messgboard/...ML/002868.html
In addition to everything I already wrote, I tightened up the egr valve and played with the cooling system. The thing that really bothered me was that the heater hoses and upper radiator hose were scorching hot after a few minutes of runtime. The lower radiator hose was ice cold. If the thermostat is closed, shouldn't the upper radiator hose be cold too? I think there might have been a large air pocket in the lower radiator hose that I squeezed out (hopefully). At this point I've had the car running about 10 times or more for about 45sec-5min each. I hope the cam has worn in sufficiently because by now I'm sure all the assembly lube is gone. Going on this assumption, I let it run at idle for a while. The headers did not glow anymore, but then again it was only at 600 rpm in park. Im supposed to set curb idle to 650 but I don't know how. It ran really rough at this speed, surging and putting, and then it finally gave me something to work with. An error code 34: vacuum sensor circuit. Do these symptoms point to a vacuum leak? Thanks and I know I write too much
John
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Mods: 14" K&N open element, 160* stat, ram-air hood, Accel cap & rotor, MSD Super Conductor Wires, 24mm solid rear & 36mm hollow front sway bar w/ PST polygraphite bushings & endlinks, Spohn SFCs, WS6 springs, SLP 1 3/4" Jet-hot coated headers, Hooker 3" cat-back, Catco high-flow cat, Comp Cams High Energy 268 cam, AFR 190 heads, Weiand Action+ intake, Comp Pro Magnum 1.6:1 Steel Roller Rockers, Moroso Oil Pan with trap doors, windage tray and crankshaft scraper, poly graphite motor mounts, K&N oil filter and Mobil 1 synthetic.
http://www.homepagez.com/350thirdgen/
https://www.thirdgen.org/messgboard/...ML/002868.html
In addition to everything I already wrote, I tightened up the egr valve and played with the cooling system. The thing that really bothered me was that the heater hoses and upper radiator hose were scorching hot after a few minutes of runtime. The lower radiator hose was ice cold. If the thermostat is closed, shouldn't the upper radiator hose be cold too? I think there might have been a large air pocket in the lower radiator hose that I squeezed out (hopefully). At this point I've had the car running about 10 times or more for about 45sec-5min each. I hope the cam has worn in sufficiently because by now I'm sure all the assembly lube is gone. Going on this assumption, I let it run at idle for a while. The headers did not glow anymore, but then again it was only at 600 rpm in park. Im supposed to set curb idle to 650 but I don't know how. It ran really rough at this speed, surging and putting, and then it finally gave me something to work with. An error code 34: vacuum sensor circuit. Do these symptoms point to a vacuum leak? Thanks and I know I write too much
John
------------------
- 84 Firebird w/ T/A gfx
- 350 4bbl (LM1)
- Automatic
- Non-leaking T-Tops (new rubber all around)
- Working headlights (new parts)
Mods: 14" K&N open element, 160* stat, ram-air hood, Accel cap & rotor, MSD Super Conductor Wires, 24mm solid rear & 36mm hollow front sway bar w/ PST polygraphite bushings & endlinks, Spohn SFCs, WS6 springs, SLP 1 3/4" Jet-hot coated headers, Hooker 3" cat-back, Catco high-flow cat, Comp Cams High Energy 268 cam, AFR 190 heads, Weiand Action+ intake, Comp Pro Magnum 1.6:1 Steel Roller Rockers, Moroso Oil Pan with trap doors, windage tray and crankshaft scraper, poly graphite motor mounts, K&N oil filter and Mobil 1 synthetic.
http://www.homepagez.com/350thirdgen/