Changed TPS not wont start
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Senior User
Joined: Mar 2011
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From: West Va
Changed TPS not wont start
I just just changed the TPS to try and fix shifting problems. I also replaced the distributor o-ring to fix a leak. Now my 93 5.8 won't start. Replaced the coil and checked for spark. Made sure distributor was in properly. Is it possible that TPS installed wrong although I don't see how. Could it be on backwards? I put it on the same way the old one was on. Any ideas would be appreciated.
Cargo Master
Joined: Jul 2009
Posts: 2,544
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From: Des Moines
Yes it is possible that the TPS is preventing it from starting. But I'm more interested in the replacement of the distributor o-ring. Not sure on this, but did you have to remove the distributor to replace it? If so you may have reinstalled the distributor improperly and now the timing is off.
If you're sure that's not the case, then remove the new TPS. Immediately reinstall it, however, install it at a 90 degree angle to the mounting surface and rotate clockwise until the screw holes line up. If it's done properly, you should feel some spring tension on the sensor.
I would also check the voltage output prior to reinstalling the throttle body. Backprobe the harness connector to the TPS. Check out this page to get a better idea of what to be looking for.
Ford Fuel Injection » Throttle Position Sensor (TPS)
Good luck and keep us updated.
If you're sure that's not the case, then remove the new TPS. Immediately reinstall it, however, install it at a 90 degree angle to the mounting surface and rotate clockwise until the screw holes line up. If it's done properly, you should feel some spring tension on the sensor.
I would also check the voltage output prior to reinstalling the throttle body. Backprobe the harness connector to the TPS. Check out this page to get a better idea of what to be looking for.
Ford Fuel Injection » Throttle Position Sensor (TPS)
Good luck and keep us updated.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
You say you check for spark but did not say if you had spark or not.
Cargo Master
Joined: Jul 2009
Posts: 2,544
Likes: 54
From: Des Moines
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Fleet Owner
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From: Easton,Ks
Scale to 0-20 DC Volts
Looking for 0.7 to 5.0 VDC.
Use the TP Sensors plug about 5 inches from the TPS.
Back probe the plug and do not unplug it.
Use the link DBGrif91 gave you in post #2 above for more information.
Key on engine not running.
Looking for 0.7 to 5.0 VDC.
Use the TP Sensors plug about 5 inches from the TPS.
Back probe the plug and do not unplug it.
Use the link DBGrif91 gave you in post #2 above for more information.
Key on engine not running.
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Senior User
Joined: Mar 2011
Posts: 117
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From: West Va
ok...checked voltage on TPS....works good....checked for spark at plugs....good....acts like it's out of time...but pulled dist. and set engine to TDC and re installed dist. so rotor was at no 1......what the @*#& did I do wrong??????????
