Thank you for your reply.
I found the cause of the problem. It happened that on December last year the pulley for the steering wheel stopped running and the belt did burn and broke up. I had a hard time driving the truck but I managed to reach home. I bought a new pulley and a new belt and that was the end of the story.
Two weeks later, the engine light started to come On and Off in sporadic events, specially when I was driving over 50mph. I took the truck to the mechanic for a full inspection, and a list was made for repairs needed. About the engine light, the code was p32, that involved the EGR system. He suggested to clean and or repair the valves. I did some mistakes, like letting the cleaner to wet the diapragm of the EGR valves, and as a precaution I replaced them. When I tried to check the EGR solenoid, I broke one of the plastic pipes and I also had to replace the solenoid. After each replacement the engine light didn't show up for one or two days, but later started to come On for a while.
So, after doing the electrical inspection followimng the directions of the shop manual, I decided to clean up the intake manifold, believing that perhaps carbon accumulation was the problem. After I studied how to remove the whole parts to reach the manifold body, and taking pictures and adding labels to wires and etc, I decided to take a last view of the hoses. I had replaced all the hoses around the EGR valve, but at this time, as a "just in case" measurement, I decided to replace also the hoses going to the carbon canister and the solenoid EGRC, located on the other side of the motor. I made this last attempt trying to save lots of work to clean up the manifold.
To my surprise, the hose going to the carbon canister had a big long and wide cut. It happened that when the steering wheel broke up, also made a huge scratch to this hose, but as it did it on the bottom of it, neither me, neither the mechanic was able to see it. From any inspection the hose should pass as OK, and only by removing it I was able to see the big cut, it was practically a long hole. The location of the cut was right where the hoses are hold with a clamp in front of the radiator.
I replaced the broken hose, rised up the seat, followed the steps to clean up the codes in the ECM, check the ECM after that, I received the 55 code and made the road test. No more problems with the engine light.
I can tell that this experience was useful after all, I have learned a lot about the EGR system and how to read codes without a scan tool (saving 50 bucks).
I never related the broken steering wheel belt with the showing up of the engine light, because it came On two weeks later and since then was acting crazy. At least I know now that a hole in this hose will cause such a weird behavior with the engine light and code p32.
Thanks again for your answer, and next time I will go further than a visual inspection if a similar problem comes with this truck or with my other vehicle.
My best wishes.
Thursday, June 2nd, 2011 AT 3:10 AM
