engine wont rev past 2000rpm?
#1
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engine wont rev past 2000rpm?
What could cause this? idles good and revs clean until 2000rpm, then acts like it has a rev limiter or somthing keeping it from reving higher. What yall think? thanks
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#9
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RPM Fuel shut off
There is a test procedure in the FSM linked in this forum for a RPM Fuel shut off. It indicates that after unplugging the TPS and jumpering the bottom two wires, the fuel shut-off should activate at about 2130RPM and drop down to 1900 repeatedly. If that is occuring, it could very likely point to a fault in the TPS.
Just a thought, but I'm new to these trucks....
Just a thought, but I'm new to these trucks....
#11
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Most of the time when that happends, the engine does more of a random spit and sputter and can not rev higher because it is lacking the fuel to do so...
The "rev limiter" remark, as in a rythmic up and down rev with the skinny pedal held down, leads me to believe a timing issue is to blame, more than likely caused incorrect information from a sensor that can alter the ingnition timing...
leading me directly to the TPS...
just my .02
The "rev limiter" remark, as in a rythmic up and down rev with the skinny pedal held down, leads me to believe a timing issue is to blame, more than likely caused incorrect information from a sensor that can alter the ingnition timing...
leading me directly to the TPS...
just my .02
#13
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#15
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Ok. swaped out the tps because the one that came off drags a little if i twist the spring. Still has the rev problem.
But just for kicks i unpluged the connector and it reved the way it was suposed to. Could it be installed wrong still? it seemed pretty self explanitory on how it fits on, i lined up the small groves on the sensor to the throttle gate piece....idk. Ill try the timing next.
But just for kicks i unpluged the connector and it reved the way it was suposed to. Could it be installed wrong still? it seemed pretty self explanitory on how it fits on, i lined up the small groves on the sensor to the throttle gate piece....idk. Ill try the timing next.
#16
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when I installed the tps on my 88, I noticed that the throttle shaft has tabs that push on the tabs in the tps, so when installing it, I rotated the tps in the direction of throttle rotation then slid it on the throttle body. then I rotated it the other way until when I let it go, the spring in it caused the tps to rotate on it's own, meaning it was pushing against the throttle tabs.
then I put the screws in it and snugged them down and connected the plug. at this point, I started the engine and bumped the tps sensor until the idle speed dropped. I bumped it both ways very slightly until I got it right at the point the speed dropped and tightened the screws.
following that, I put a jumper in the diagnostic TE1 and E1 terminals to make sure the ECU was getting the IDL signal (the rpm's drop even more) and checked the timing.
then I put the screws in it and snugged them down and connected the plug. at this point, I started the engine and bumped the tps sensor until the idle speed dropped. I bumped it both ways very slightly until I got it right at the point the speed dropped and tightened the screws.
following that, I put a jumper in the diagnostic TE1 and E1 terminals to make sure the ECU was getting the IDL signal (the rpm's drop even more) and checked the timing.
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