20 Most Recent 1990 Ford F350 Questions & Answers

Question edited for clarity. @Randall Andre. It wasn't answered because of the way the question was written back to front. Generally 14 year old questions don't get answered. It is better to write your own. In the link. https://www.google.com/search?q=1988+ford+econoline+e-350+ecm+location A Service Manual is always a good investment https://www.google.com/search?q=1988+ford+econoline+e-350+service+manual ..

Check to make sure the power line going into the switch is hot. If you have power going into the switch and no lights then you need to replace the headlight switch a very simple thing to do.

Check 4 bad earth

as the engines are the same , it should fit straight in items to consider is the drive shaft slip joint size and spline numbers

Long shot, how about the air cleaner?

Yes, cracked manifold can let oxygen in, which tells the pcm to enrich the mixture. You are probably running rich. Really bad for gas mileage too. Replace the manifold.

It sound like a bearing issue. I would recommend checking oil pressure. This should be done both cold and hot. Allow engine to cool over night, you can get an inexpensive oil pressure tester at most parts stores. Remove the oil pressure sender near the oil filter. Attach the oil pressure tester to this port. Start and run engine. Cold oil pressure should ideally be around 40psi, with hot oil pressure around 20. If the pressure drops significantly or never really is satisfactory this may indicate a larger issue. It could have a bad or restricted oil filter. It could also have excessive clearance on the bearings, indicating wear and the need for new bearings.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Best Manuals

The multi function switch is a string possibility.

SCAN FOR TROUBLE CODES!.. FIND OUT WHAT'S WRONG!.. amazing!

Diesels do not have carburetors

governor pressure to high, possible causes governor is sticking high vacuum at modulator bad modulator engine rpm to high miss aligned lincage

They run on regular. Sometimes I put in midgrade every 3rd time I add gas.

Check auto choke fast idle,free up choke butterfly.

Most likely the IGN Module in the Distributer.. it is the thing that the wires are attached to under the distributer, usually gray in color.. could be the coil, could be not getting a 12v single from the ign switch to the coil.