I have a 92 F150 and the CEL came on today. I pulled the codes and this is what I got:

10 Check code
111 System pass
172 o2 sensor fault, Lean
173 o2 sensor fault, Rich
332 Insufficient EGR Flow
542 Fuel pump secondary circuit fail
618 Trans. 2-3 shift error

I recently bought this truck so who knows if any of these were old codes that werent cleared. It was hot today and I had the A/C going and I got some detonation going up a hill, so I hit the tow/haul button and shifted down to get the RPMs up which stopped the detonation.
Im going to pull the EGR and see if there is carbon build up on the plunger, would the o2 sensor fault be from the EGR not opening? Im going to let this thing cool off and then clear the codes and see if the light comes on again.

Thoughts anyone?

 

I pulled the EGR and the plunger is free and moving when I suck on the vacuum port. Whats next, vacuum leaks elsewhere? How would I check this?

 

how did you get those codes using a jumper and the MIL with the engine off. if you have a fuel pressure gauge try checking the pressure when the engine is pining or when you drive it. just to make sure how are your battery connections clean and tight. your egr code does not mean its with the valve it self it could still have poor circulation with a working egr. how.. does it run cold engine. is your engine stock and PCM.

 

I plugged in a reader under the hood to get the codes and those are the codes that came up. The engine is bone stock. Battery connections are clean and tight. The engine runs at normal temps until it pings/detonates and then the temp starts to climb. Lately the pinging occured when I was towing a small trailer, up a hill and with the A/C on. I cleared the codes last night and the CEL came on again this morning with the same codes. This time it came on in the morning when the temp outside was cool and the A/C was off and I wasnt pulling a trailer. In overdrive when the engine is at lower RPMs it will ping when going up a mild hill. I can hit the overdrive off button which will drop down a gear and raise the RPM. This will stop the pinging.

 

The EGR feedback system on the OP's truck is position based, not flow. Code 332 for this vintage truck means EGR opening is not detected.

Verify the vacuum circuit to the EGR is intact. Manifold vacuum to the EVR then onto the EGR valve.

 

so it does this cold or hot or only when its hot. do you have a fuel pressure gauge. if the EGR never opens then you have no flow not to say its anything like later models but if it does not open then you have a no flow as far as the computer goes.

 

Nothing to do with flow...it's position based from the EVP.

 

yes I understand that what I am saying is the point of an egr valve is to control exhaust flow if its not opening then you have a no flow not saying the computer measures exhaust and intake pressure in any way like the newer models I am not dis agreeing but what I was talking about was not system design but basic function if the valve does not open then nothing is drawn in to the engine.

 

Im confused by your "flow" statements.. I tested the EGR valve itself and the plunger moved under my own suction but the computer is not detecting an opening. This must be from a bad sensor to the computer or a vacuum leak somewhere but im not sure where to start. I dont see any brittle vacuum lines back to the EGR solenoid. Could the solenoid be bad and if so, how do you test it?

 

sorry about the flow statement it was a misunderstanding between me and another member from I think my original post about circulation being air flow or vacuum. to or at the valve no exhaust flow just ignore that. you should have vacuum going to your egr solenoid at idle. you egr should not come on at idle so it should not have vacuum at the valve. check for vacuum at the regulator or solenoid then you can test the regulator or any electrical circuits. do you have a volt meter and a test light and why do you say the computer does not detect the valve opening when you force it open make sure the egr vacuum line holds true in the test.