Engine Miss
Thread Starter
|
New User
Joined: May 2002
Posts: 11
Likes: 0
From: California
Engine Miss
I have a 1988 F-150 with the 300 EFI. Engine has approx 95,000 miles. I have a miss when the engine warms up. I tried seeing if the miss goes away when the temp sensor is unplugged no good. I have been chasing this for several months. I have checked the codes, only had one for the power steering pressure switch. I have cleaned all of the power and grounds on the truck, have replaced the following items,
ECM, EGR, TPS, PLUGS, WIRES, CAP, ROTOR, CAMGEAR, HEAD GASKET, INTAKE and EXHAUST MANIFOLD GASKETS, IAC SOLINOID GASKET, INJECTOR, COMPLETE DISTRIBUTOR, checked all rockers and camlift, compression on all cylinders, all above 90 cold and dry. When the cylinder head was off, I checked the vaccum checked the valves all ok, no bleed down. The pistons all look good, no scoring on the cylinder walls. The miss is only on number one cylinder. I switched the injector with another cylinder still the same. I have removed the entire wiring harness and inspected for rubbed through spots, found nothing. I checked fuel pressure, right on the money, I beleive it was 60 psi. I have given up on this, the local Ford dealer has no idea why and still cost me 480.00 to tell me this. Any ideas out there??????
ECM, EGR, TPS, PLUGS, WIRES, CAP, ROTOR, CAMGEAR, HEAD GASKET, INTAKE and EXHAUST MANIFOLD GASKETS, IAC SOLINOID GASKET, INJECTOR, COMPLETE DISTRIBUTOR, checked all rockers and camlift, compression on all cylinders, all above 90 cold and dry. When the cylinder head was off, I checked the vaccum checked the valves all ok, no bleed down. The pistons all look good, no scoring on the cylinder walls. The miss is only on number one cylinder. I switched the injector with another cylinder still the same. I have removed the entire wiring harness and inspected for rubbed through spots, found nothing. I checked fuel pressure, right on the money, I beleive it was 60 psi. I have given up on this, the local Ford dealer has no idea why and still cost me 480.00 to tell me this. Any ideas out there??????
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Freshman User
Joined: Apr 2003
Posts: 42
Likes: 0
Engine Miss
Couple of questions:
1. How do you know #1 cylinder is missing?
2. You indicated the head was off, was this a recent repair? Why did you pull the head?
3. What did you mean, you changed injectors, still #1 is missing? Did you physically change the injectors? This is important clue to help isolate the cause.
4. Did you just perform a visual inspection of the wires? Did you performa an electrical continuity check? Wiggled the wires while checking?
I bet if you write down what you have done, you can take a systematic approace to isolate the true problem and will be able to solve it.
Jerry
1. How do you know #1 cylinder is missing?
2. You indicated the head was off, was this a recent repair? Why did you pull the head?
3. What did you mean, you changed injectors, still #1 is missing? Did you physically change the injectors? This is important clue to help isolate the cause.
4. Did you just perform a visual inspection of the wires? Did you performa an electrical continuity check? Wiggled the wires while checking?
I bet if you write down what you have done, you can take a systematic approace to isolate the true problem and will be able to solve it.
Jerry
