North American Turbocoupe Organization



car almost stauls everytime i start it...
r3lic76 Offline
Member
#1
Everytime i start my 88 TC, the RPM goes up and comes down but instead of staying at 1000rpm, it drops lower and stauls unless i give it some gas a few times and it appears that the computer compensates and keeps it alive

one thing that might cause it could be my wastegate, i have an adjustable rod that i have made shorter (so that the boost stops around 18psi) but since the rod is shorter, my T3 spools a lot slower because the "gate" is partially opened due to a shorter rod (if i make the rod longer, my T3 spools past 18psi instantly in first gear on a launch...mainly due to a completely closed wastegate)

i made the rod shorter in the first place because i didn't want the T3 spooling forever (it would hit the 17.5 buzzer at 4000rpm and i dont have a boost guage yet)

but my friend (eighteen-psi) said that since the wastegate is partially open, it puts exhaust into the intake via the EGR (or something like that)

another thing, currently my car bogs sometimes when i boost it too much, such as about 17.5 plus or minus 1 and it isn't the knock sensor because it bogs and continues to run like crap for about 20 seconds (my friend says EGR lets in excess exhaust or something)

any THOUGHTS?
88 Turbocoupe - T3 conversion - bbk255 - kirban FPR - open 3" dp - ported lower intake
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r3lic76 Offline
Member
#2
ok i searched and found that my TFI/PIP might be bad

where can i get a new TFI/PIP? does it have to be ordered, how much is it?


the car has been running fine for 4 months and just started doing this so i doubt it's the wastegate issue i mentioned
88 Turbocoupe - T3 conversion - bbk255 - kirban FPR - open 3" dp - ported lower intake
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86tc Offline
Member
#3
Get one from Ford (Motorcraft brand only). Too many people have had problems with other brands only lasting from a month to a year.

Rick
'62 Ranchero (in progress...again)
'72 Gran Torino Sport (for sale/trade)
'76 Honda CB750 (for sale/trade)
'88 Yamaha Blaster Race 4-wheeler (for sale/trade)
'89 Lincoln Town Car (for sale/trade)
'92 GMC Safari Conv. Van (for sale)
'94 Pontiac Bonneville
'96 GMC Jimmy
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Jeff K Offline
Administrator
#4
Quote:Originally posted by r3lic76:
Everytime i start my 88 TC, the RPM goes up and comes down but instead of staying at 1000rpm, it drops lower and stauls unless i give it some gas a few times and it appears that the computer compensates and keeps it alive

one thing that might cause it could be my wastegate, i have an adjustable rod that i have made shorter (so that the boost stops around 18psi) but since the rod is shorter, my T3 spools a lot slower because the "gate" is partially opened due to a shorter rod (if i make the rod longer, my T3 spools past 18psi instantly in first gear on a launch...mainly due to a completely closed wastegate)

i made the rod shorter in the first place because i didn't want the T3 spooling forever (it would hit the 17.5 buzzer at 4000rpm and i dont have a boost guage yet)

but my friend (eighteen-psi) said that since the wastegate is partially open, it puts exhaust into the intake via the EGR (or something like that)

another thing, currently my car bogs sometimes when i boost it too much, such as about 17.5 plus or minus 1 and it isn't the knock sensor because it bogs and continues to run like crap for about 20 seconds (my friend says EGR lets in excess exhaust or something)

any THOUGHTS?

First of all, the WG will have NO effect on ANYTHING with the car idling / throttle closed. Doesnt matter if the WG is stuck open, stuck shut, disconnected, etc.... no effect on idle, and NO effect on EGR flow. Besides, the EGR valve is closed at idle, and with motor cold anyway. If the EGR valve were stuck open, the car wouldnt idle at all, ever. The EGR valve is also closed at WOT, and will have zero effect on WOT performance.

Do not throw money at the car by buying a new TFI / PIP! Quality parts will cost you around $150 vto $200, and likely wont solve your problem. First thing to do is run the codes, looking for and continuous memory codes in the KOEO test, and "cant control idle" codes in the KOER test.

Try cleaning your IAB valve.

Have you cheecked your fuel pressure?

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Pete D Offline
Administrator
#5
The WG isn't your idle problem. The shorter rod would hold your WG closed, not open. I'm thinking you adjusted the rod and put it in the WG pivot arm when the WG was open, not closed like it should be. The WG is closed when the hole for the rod is. on the pivot arm, closest to the WGA, measured distance.

On the idle, I would check and clean the IAC first then check the setting for the idle and TPS. if it's a poblem after that, then pull the codes

The WG does not put exhaust into the intake via the EGR. The wastgate is far downstream of the EGR tube in the exhaust manifold. Same with your bogging problem. The EGR is supposed to be closed during boost. Sounds like you may need to run the fuel system diagnostics. E-mail me if you want them.
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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm

[This message has been edited by Pete D (edited 11-15-2002).]
Pete Dunham


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r3lic76 Offline
Member
#6
Yea i had it backwards when explaining the wga rod. I make the rod longer to keep the WGA shut.

The reason why I have those wastegate issues is because eighteen-psi took off the flange on the T3 housing (to fit my intercooler of course) and rotating the housing a little bit which causes the WGA to be at an angle....therefore the rod doesn't go straight into the WG, its kinda bent at an angle.

While I'm at it, any suggestions on how to fix the WG?

And what does the fuel system have to do with EGR? (or the car bogging)
88 Turbocoupe - T3 conversion - bbk255 - kirban FPR - open 3" dp - ported lower intake
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r3lic76 Offline
Member
#7
how do i clean the IAC, im not sure which one is the IAC (cannot tell from the sensor picture in tech articles)
88 Turbocoupe - T3 conversion - bbk255 - kirban FPR - open 3" dp - ported lower intake
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Pete D Offline
Administrator
#8
The IAC is the cylinder like thing mounted on the back side of the throttle body. 2 bolts hold it on. Remove it and you will see a couple of holes. Take the solenoid of the end of it (2 screws) and then spray it out with carb or brake cleaner until all the carbon is gone. Then put it back together and re-install it.

Setting up the WG: see the pictures. In the first picture the WG is closed and the pivot arm hole is the shortest distance from the WGA actuator (diaphram) This is the position you want to install the rod into the WG pivot arm hole. You want to adjust the rod to the point where is just holds the valve closed. In the second picture, my hand is holding the WG flapper valve open. Notice that the pivot arm hole is farther away from the diaphram, ie the diaphram would have to push the rod toward the WG to open the valve.

I got your e-mail and will send a response shortly

How it works. the WGA holds the WG vlavle closed until it receives enough boost pressure (9 to 10psi) then it starts to open the WG by pushing the rod TOWARD the WG which moves the pivot arm from closed to some degree of open.

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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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r3lic76 Offline
Member
#9
yea my WG rod is correctly installed to the pivot arm, I just need to readjust the rod so that the gate is closed

but another side issue is that the rod doesn't go into the diaphram perfectly at a 90degree angle (perpendicular), it goes in at an angle as if the diaphram was (and it is) rotated a little bit (along with the housing)

thanks for all the info
88 Turbocoupe - T3 conversion - bbk255 - kirban FPR - open 3" dp - ported lower intake
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Pete D Offline
Administrator
#10
As long as the angle is not too great, it won't make a difference. I had to do the same thing for the T3 install
Pete Dunham


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