High RPMs after fuel problem

Reply Subscribe

Thread Tools

Search this Thread

Nov 14, 2008 | 12:05 PM

hinote_96

Thread Starter

4wd High

Joined: Apr 2008

Posts: 9

Likes: 0

High RPMs after fuel problem

I have an 87 F150 302 4spd manual that I got from my dad. I went out to start it one day and it would turn over but not start. After much diagnosis I finally narrowed down the the fuel pump in the tank. Now that the fuel is flowing again it starts however it immediately goes to 2000 rpm and runs for about 1 min before it shuts off. I checked for vacuum leaks but didn't find any. After reading many posts the TSP or fuel pressure regulator. Any ideas?

Nov 14, 2008 | 01:09 PM

05chop

Elder User

Joined: Aug 2007

Posts: 502

Likes: 0

What was your fuel pressure after you installed a new tank pump?

Nov 14, 2008 | 01:31 PM

hinote_96

Thread Starter

4wd High

Joined: Apr 2008

Posts: 9

Likes: 0

I don't think I checked to pressure again after I installed the new pump. I had borrowed a tester and had already returned it. Should I check it again?

Nov 14, 2008 | 01:51 PM

05chop

Elder User

Joined: Aug 2007

Posts: 502

Likes: 0

This makes a good mechanic checking his work.It wouldnt hurt to recheck the fuel pressure.Also did you check for fuel in the vacume line that goes to the fuel pressure regulator? These all are easy checks.

Nov 14, 2008 | 02:06 PM

andym

Post Fiend

Joined: Mar 2002

Posts: 19,402

Likes: 38

From: Bonita Springs FL

There's no way that an engine can run at 2000 RPMs unless the throttle plates are open or there's a severe vacuum leak.

Nov 14, 2008 | 02:16 PM

05chop

Elder User

Joined: Aug 2007

Posts: 502

Likes: 0

How did you check for vacume leaks? hinote 96?

Nov 14, 2008 | 03:24 PM

Lazy K

Post Fiend

Joined: Jan 2005

Posts: 8,402

Likes: 10

Quote:

Originally Posted by andym

There's no way that an engine can run at 2000 RPMs unless the throttle plates are open or there's a severe vacuum leak.

Vacuum leak gets my vote.

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Nov 16, 2008 | 03:53 AM

pfogle

Lead Driver

Joined: Feb 2003

Posts: 8,140

Likes: 4

From: Oak Harbor, OH

Quote:

Originally Posted by andym

There's no way that an engine can run at 2000 RPMs unless the throttle plates are open or there's a severe vacuum leak.

That is where you would be wrong sir. If the TPS is bad and it's sending an elevated signal to the computer it will open the IAC and it will run at about 2k rpm. I had a 351wEFI do this to me a few years ago. We didn't have any of the tools needed to test the parts so I took it to family friend who was a mechanic. Replaces the TPS and all was well once again.