What causes a truck engine to surge?

If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.

What kind of transmission does a 1990 Ford F-150 have?

The 1990 Ford F-150 pickup truck had four transmission choices: a three- or four-speed automatic and a four- or five-speed manual. Ford built some transmissions and acquired the others from outside vendors or other automakers. Ford built the C-6 three-speed automatic transmission from 1966 to 1996.

What should the ohms be on a 1990 Ford F150?

You should be getting around 33 ohms at 75 degrees on either sensor. If you are not getting that then they are bad. Let me know how it goes. helpful? Long story short.

Why does my 1990 Ford F150 run rough?

This will happen for a few days then run great for a few days. When it is happening the truck still has plenty of power, runs fine during acceleration but dies shortly after I let off gas. When it is running bad it is running VERY rich (that is why its running rough I think) but I can’t figure out why its running rich.

What to do about intermittent idle on a 1990 Ford F150?

I installed a spacer kit under the speed control as per old Ford bulletin, checked fuel pressure (50psi) and cleaned injectors. I have read lots of forums and found people with this exact problem (on Fords) but no answers on what fixes it. The fact that it is intermittent and shows no codes is killing me. have the same problem?

What kind of engine does a Ford F-150 have?

The 4.9 Six was a big-block version of the old Falcon six-cylinder engines, and powered F-150s and commercial trucks since 1964. The 1992 F-150 4.9-liter version generated 145 horsepower. The 1992 5-liter V-8, which developed 185 horsepower, derived from the original 302-cubic-inch V-8s that originally powered the first-generation Mustangs.

When did Ford F150 service manual come out?

FORD F150 SERVICE & REPAIR MANUAL (1997 1998 1999 2000 2001 2002 2003) – DOWNLOAD! Download Now

Why does my 93 F150 302 hesitate and surge?

EGR works properly. This problem is only in closed loop. While the engine is cold everything seems to work fine. I can open the throttle a bit, say 1500, and there’s a surge, or maybe you could call it an “anti-surge” where the rpms will drop a bit and engine roughens up a bit, then it goes back up and smooths out, then cycles back down.

What causes a truck engine to surge?