Help With Engine Shudder and Stalling!!
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Help With Engine Shudder and Stalling!!
I recently bought a 1989 F150 2wd with a 5.0. Truck was running great, no problems whatsoever. Out of nowhere a few days ago when I started it, it was idling really rough and and the engine was shuddering. When I press the throttle slow it shudders violently but if I really press down on it, it smooths out and drives great. Cruising it shudders but not bad. After its been warmed up it'll begin to stall when I come to a stop.
It gave me 23 and 34 when I pulled the codes. Replaced the EGR and EVP sensor and tried again. Truck ran the same, self tested and pulled codes again and got:
21 ECT out of range
22 MAP or BARO signal out of range
23 TPS out of range or set too high
44 AIR system inop
34 EVP sensor
52 power steering pressure switch
I've gone through and double checked the vacuum lines going to the MAP sensor and EGR valve and they look good.
Any ideas would be appreciated
Thanks!!!
It gave me 23 and 34 when I pulled the codes. Replaced the EGR and EVP sensor and tried again. Truck ran the same, self tested and pulled codes again and got:
21 ECT out of range
22 MAP or BARO signal out of range
23 TPS out of range or set too high
44 AIR system inop
34 EVP sensor
52 power steering pressure switch
I've gone through and double checked the vacuum lines going to the MAP sensor and EGR valve and they look good.
Any ideas would be appreciated
Thanks!!!
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
21 ECT out of range - did you warm the engine up before doing the self-test?
22 MAP or BARO signal out of range - that would be the MAP sensor.
23 TPS out of range or set too high - need to verify this with a DVOM.
44 - AIR system inop - this would not cause your problem.
34 EVP sensor - this also would not cause your problem.
52 power steering pressure switch - did you turn the wheel during the self-test? (Won't cause your problem anyway.)
22 MAP or BARO signal out of range - that would be the MAP sensor.
23 TPS out of range or set too high - need to verify this with a DVOM.
44 - AIR system inop - this would not cause your problem.
34 EVP sensor - this also would not cause your problem.
52 power steering pressure switch - did you turn the wheel during the self-test? (Won't cause your problem anyway.)
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21 ECT out of range - did you warm the engine up before doing the self-test?
22 MAP or BARO signal out of range - that would be the MAP sensor.
23 TPS out of range or set too high - need to verify this with a DVOM.
44 - AIR system inop - this would not cause your problem.
34 EVP sensor - this also would not cause your problem.
52 power steering pressure switch - did you turn the wheel during the self-test? (Won't cause your problem anyway.)
22 MAP or BARO signal out of range - that would be the MAP sensor.
23 TPS out of range or set too high - need to verify this with a DVOM.
44 - AIR system inop - this would not cause your problem.
34 EVP sensor - this also would not cause your problem.
52 power steering pressure switch - did you turn the wheel during the self-test? (Won't cause your problem anyway.)
The engine was warmed up and I did not move the steering wheel during the self test.
Have not got around to testing with a DVOM.
Tomorrow I will be testing the MAP sensor with a multimeter. How do I go about testing the TPS?
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