Yes I have had throttle bodies where the shaft is loose and causes high or surging idle. i'm 99% sure SPR rebuahes all their units so I wouldn't worry there. FWIW, a '7427 pcm (or '7060) would have controlled your TBI and 4L80E.
Yes I have had throttle bodies where the shaft is loose and causes high or surging idle. i'm 99% sure SPR rebuahes all their units so I wouldn't worry there. FWIW, a '7427 pcm (or '7060) would have controlled your TBI and 4L80E.
I have the $4F mask. At the time i was not confident about installing and possibly repinning a different ECU. If this continues i might try going with a different unit.
I have a CJ build i can use the MSD with.
I dislike unsolved threads so i wanted to post, It has been a month and the truck has been running perfect and not one instance of high idle. I guess i will leave as is for now.
If I ever figure it out I will post the solution,
Chris
Hello all,
The issue is back today and more consistent. When it idles high i don not have Idle/cool flag
high idle flag.JPG
when it idles normal I have the Idle/cool flag.
normal flag.JPG
Any idea what this means? This time at high idle my IAC counts were only 56. but going from reverse to drive the RPM shoots up. Other than re-pinning a better ECU any options?
Possibly solved,
Just in case someone reads this in the future i may have found the culprit. I came home the other day with the high idle, before anything else I grabbed the laptop and data logged.
The TSP data was jumping around from ~.4 to .9 at idle. Resetting the key the ECU starts with a new voltage reading and idles ok. When it starts fluctuating the IAC gets confused? The TPS test ok, It operates smoothly from .54 to 4.7 volts but when it got hot enough it would act up. Not with rhythm, just a blip here and there. Unless you sit and watch the data you would never catch it.
Anyway, tossed another TPS on it and for now appears to be ok.
Chris
Thank you so much for following through with your solution. I have that same issue, though I'm sure I've swapped TPS's since it started. Still, I'll toss in a new one and keep this one as a spare.
The defective TPS came on my SPR throttle body. Maybe it was used/reconditioned,, it was cleaned to appear new. The injectors on the SPR performance TBI failed in one year also.Originally Posted by Dieselsj
The TPS that is on my truck now is from the junk yard,, I had it on an old crusty mock-up TBI i was going to use on another build. I was worried it did not have the slots to adjust but it seems ok. It reads .74 volts at idle.
Good luck,
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