North American Turbocoupe Organization



Misfire at Idle '88 tc
mikeylinden Offline
Junior Member
#1
Hey guys, i have a problem. i finally got my TC running after a long time, i blew my head gasket some time ago... but after putting everything back together and figuring out the timing it runs ok, except for a misfire at idle, not all the time though, just randomly miss every couple seconds. If i rev it it doesnt miss and after coming back down to idle it doesnt miss for about a minute then back to it. I dont really know what to do, my friend tells me the timing if of, but i think if it was it would miss all the time. Someone else tld me maybe a dirty\clogged injector? Any ideas would be great, thanks.
- Ken
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thumper Offline
Posting Freak
#2
I had this problem before, and seem to have to have it now again. First it was after a headgasket swap, not its after installing the same motor in a different car with new seals all over.

The first time (and this time, I suspect) vacuum lines were to blame. When it revs the air mix is greater, so a slight leak won't matter much (no miss). At idle where it is flowing less air a slight leak tweaks the idle mixture a proportionally larger amount.

Check for vacuum leaks, in other words.
A.K.A. Corey Bennett

1988 TC: white, all options, 5-speed swap, K&N cone filter, "Ranger" roller camshaft, .60/.63 T3, NXS (Gillis-style) Boost Valve, Bosch BOV w/ check valve, Stinger 3" with axle dump (18" glass pack), 95A 3G

Some pictures: http://s639.photobucket.com/albums/uu111/cbennett4041/
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mikeylinden Offline
Junior Member
#3
ok ill have to check it out, what do you think are vacuums that are commonly missed? which is the one you missed?
- Ken
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Pete D Offline
Administrator
#4
Check them all, especially the hard plastic ones

Here is another article you should read:
http://natomessageboard.com/ultimatebb.p...0;t=000004
Pete Dunham


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thumper Offline
Posting Freak
#5
Agreed on the hard plastic ones. Pete mentioned it in the past several times: plug off one line at a time at the vacuum tree till you narrow down where the miss is. Then you can isolate the cause.
A.K.A. Corey Bennett

1988 TC: white, all options, 5-speed swap, K&N cone filter, "Ranger" roller camshaft, .60/.63 T3, NXS (Gillis-style) Boost Valve, Bosch BOV w/ check valve, Stinger 3" with axle dump (18" glass pack), 95A 3G

Some pictures: http://s639.photobucket.com/albums/uu111/cbennett4041/
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