Posted by Hobo,NC on March 26, 2020 at 05:33:59 from (75.137.54.87):
In Reply to: 91 Ford F150 trouble posted by 55 50 Ron on March 25, 2020 at 18:41:06:
I don't think a 91 gives scan data : (;
I would confirm grounds good at the battery and all leads that come off the battery ground are clean bright and tight both ends.
I would check for vacuum leaks most common where the plenum mounts to the intake.
I would run a KOEO test... Address any KOEO codes before I run a KOER test.... After warm KOEO codes repaired then run a KOER test.
Install Fuel pressure gauge and leave it on till its fixed...
Then hook up a break out box and check MAF, ECT, IAT, TPS, EGR sensor. The process is elimination to confirm sensors are good/bad are in range.
Those are a demon it takes some special equipment to diagnose them properly in a timely fashion. A good understanding of how the system works mainly because of no menu (scan-data)
I would not throw the parts cannon at it till I confirmed all of this... Its not uncommon for the fuel tank/tanks to be full of rust and the injectors restricted : (
On a 91 everything is suspect including the o2 sensors, ignition and basics... I have many stories where it was something simple it was a long road to get there... If you take it to a shop you will need a shop that cut their teeth on a ford with no scan data... A good question to ask do you have a ford 60 pin break out box and know how to use it...
There are no silver bullets until all basic have been confirmed : (
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