CLASS RACER FORUM - View Single Post - Need Help Troubleshooting a 1994 F350, I'm desperate!

Tony396 · 07-15-2007, 08:12 PM

First up..thanks for all the help.

Here's what I found and came up with today.

I really don't think it is a fuel issue...but I don't know for sure yet.

Rock solid fuel pressure...40-42psi at idle, when key is turned, and through jumpering the pump at the test plug...Holds it for hours also when the pump isn't running. When I wind it up a bit it increases a bit, and then drops back down to 40 at the worst. If I had a clog or restriction somewhere, I don't see how it could hold that pressure, especially with 14 year old pumps.

I pulled every plug under the hood and checked for loose or dirty connections. All looks OK.

I did a resistance test on the TPS. Weird thing happened. As I opened it up, slowly and smoothly, the resistance went down, up, and then down again...which leads me to believe that it is my culprit. According to all my research and some suggestions here and other places, it should be a clean sweep on the multimeter. Ordered one today, will be here tomorrow.

Just for craps and giggles, I ordered a MAP sensor also..figuring it too is 14 years old and for $50 it's cheap insurance.

We'll see what happens.
Thanks!
Tony

07-15-2007, 08:12 PM	#7
Tony396 Junior Member Join Date: Jun 2003 Location: North Hanover NJ 08562 Posts: 19 Likes: 0 Liked 0 Times in 0 Posts	Re: Need Help Troubleshooting a 1994 F350, I'm desperate! First up..thanks for all the help. Here's what I found and came up with today. I really don't think it is a fuel issue...but I don't know for sure yet. Rock solid fuel pressure...40-42psi at idle, when key is turned, and through jumpering the pump at the test plug...Holds it for hours also when the pump isn't running. When I wind it up a bit it increases a bit, and then drops back down to 40 at the worst. If I had a clog or restriction somewhere, I don't see how it could hold that pressure, especially with 14 year old pumps. I pulled every plug under the hood and checked for loose or dirty connections. All looks OK. I did a resistance test on the TPS. Weird thing happened. As I opened it up, slowly and smoothly, the resistance went down, up, and then down again...which leads me to believe that it is my culprit. According to all my research and some suggestions here and other places, it should be a clean sweep on the multimeter. Ordered one today, will be here tomorrow. Just for craps and giggles, I ordered a MAP sensor also..figuring it too is 14 years old and for $50 it's cheap insurance. We'll see what happens. Thanks! Tony