Pete D
Joined:
Apr 2001
Northern OH
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Kev, maybe you already posted but do you have any codes?
Vacuum is lower during a cold start until the walls and rings get oiled and the piston/rings/walls start to warm up and seal.
I agree, it sounds like something may not be sealing, but I don't know what is going to get warm enough in 30 seconds to make a difference.
Also, have you checked fuel pressure?
Pete Dunham
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Kev
Joined:
Apr 2001
Harrison Arkansas
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Kev
Posting Freak
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Pete, I haven't had any codes since I changed the TFI out around a month ago. I realize that vacuum is lower at startup, but my vacuum hovers around 10-12 inches when I first start it up, then it's at around 19 less than a minute later.
Checked fuel pressure and had about 45 psi on the stock regulator with the vacuum line unhooked. I thought that was weird and I bought an adj. kirban to replace it. I set the fuel at 41 after testing different pressures trying to get rid of detonation. The detonation never went away--assume boost leak or vacuum leak--so I had to reduce my timing to 10 instead of 12. I still get a slight detonation at WOT at the top of 3rd gear, but it's better than it was. I'm hoping that when I find the vacuum culprit, it will sort out the dieing/1st and 2nd gear hiccup/detonation problem. Yeah...hoping.
Kev
1988 TC 5spd
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Pete D
Joined:
Apr 2001
Northern OH
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Ok. Cold vacuum of 10-12" is low
How about air leaks, not vacuum leaks. Anything between the VAM and the front of the TB.
VAM hose, IC hoses, leak in the IC itself??
Pete Dunham
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Kev
Joined:
Apr 2001
Harrison Arkansas
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Kev
Posting Freak
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Air leaks is what the pressure test should find. I could put my pressure tester on the front of the VAM instead of the turbo, but the VAM doesn't see boost and I was afraid the 20psi would pop its top. I'm not sure how to test for leaks around the VAM.
As for the intercooler, I didn't hear any leaks in the couplings around it or in the intercooler itself when I pressurized it yesterday. But, I was pressurizing the valve cover too and air was coming out of the oil cap and breather, so I wasn't able to get the full 20psi in the engine before having to shut down the compressor. I'll know more in a couple days after I get the gasket replaced, and I'll report back then.
Kev
1988 TC 5spd
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Pete D
Joined:
Apr 2001
Northern OH
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Kev, I meant the VAM hose, take it off look for worn spots, especially the bottom area where it might be rubbing on something
Pete Dunham
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Kev
Joined:
Apr 2001
Harrison Arkansas
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Kev
Posting Freak
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Unlikely it's the VAM hose since it's all of 3 inches long, but I'll check it anyway.
Kev
1988 TC 5spd
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jmthunderbirdturbo
Joined:
Feb 2005
Ostrander, Ohio
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poor idle on cold is usually a condition of a faulty or mis-adjusted TPS. check that its set at .94v KOEO. (off)
-J0N
APRIL 2018 - LOOKING FOR A NEW CAR. PM me if you have an 87-88 roller or cheap TF for sale.
1988 TC 5MT-Blue/Blue check-off car. resto-project.
2006 Honda Odyssey 5AT, baby-mobile.
2013 F-150, 5.0, 6AT, 4x4, snow white paint.
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84TBirdTurbo42
Joined:
Jun 2006
Angola NY
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also, there was a tsb in the late 80's with cold start up issues caused by excessive carbon on the intake valves.. however the fix would be to take it to a ford dealer... and find a tech that knows how to use the appropriate tool.. good luck with that. however, im not sure if the tsb really applies, seeing as it was a problem with fuel that people were burning
Chris Perry
1984 Ford Thunderbird Turbo Coupe. Dead, NY rot killed her
1986 Thunderbird shell, swapping parts from the 84.
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Keith Nubel
Joined:
Apr 2001
Liberty Township, OH
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Is the EGR sticking open a little bit?
1985 TC
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