sometimes when i start my 88 5.0 sitck, it will run way to fast. around 2 rpm...when usually it is around 1. it is tuned correctly because I just set the timing and fuel the other day, and it was running good after i did that. I also cleaned the IAC. the problem seemed to go away. but still sometimes it does it as it did tonight, and seems to be getting worse. it still drives good but it is like it is driving it self and needs to calm down, but wont. the idle will just go up for no reason. up to 2 1/2 rpms... i have read that this could be a bad tps. i tried to set it the other day. I got it as close to specs as I could, which was about .89, I couldnt get it to go any higher. what do you guys think?
is my TPS sensor bad or going bad ?
- Thread starter 85cleangtvert
- Start date
Did you clean the throttle body? That might be giving you the rpm hangup.
.89v is fine unless you want to elongate the slots on the sensor. But did you do a sweep test when you were checking the TPS? You want to open the throttle when you have the voltmeter hooked up, and see if it incrementally goes up around 4.5V., but my bet is in the throttle body or the engine harness connectors. Disconnect them and clean and use di-electric grease before reconnecting.
I'd also scan for codes while your under the hood.
.89v is fine unless you want to elongate the slots on the sensor. But did you do a sweep test when you were checking the TPS? You want to open the throttle when you have the voltmeter hooked up, and see if it incrementally goes up around 4.5V., but my bet is in the throttle body or the engine harness connectors. Disconnect them and clean and use di-electric grease before reconnecting.
I'd also scan for codes while your under the hood.
srothfuss
Last night I stabbed the same guy 7 times in a row
Symptoms of a bad TPS:
When you lift off the throttle, the RPM's increase as you shift.
When you are costing to a stop / stopped your idle hangs above it's normal setting
A true indicator: If you experience these two problems and simply turning off the car / and back on cures it... than the TPS is suspect.
When you lift off the throttle, the RPM's increase as you shift.
When you are costing to a stop / stopped your idle hangs above it's normal setting
A true indicator: If you experience these two problems and simply turning off the car / and back on cures it... than the TPS is suspect.
yes, i cleaned the throttle body the other day when i was tuning up the car. it looked good and opened and closed nicely with no hang ups. the tps went up to 4.30 maybe higher but it looked as if it was working cool. where are the engine harness connectors? why would it be them? i have scanned for codes and i really hate the beeping code reader we have. i have been meaning to buy one that shows it digitally. my car throws codes so i need to check that out.
See http://www.members.tripod.com/sparkplugs/idle.htm for some help on your surging idle.
This site points to bad TPS sensors as being the culprit in the surging idle that goes high and sticks until you shut off the engine.
This site points to bad TPS sensors as being the culprit in the surging idle that goes high and sticks until you shut off the engine.
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