is there a check i can do to test the chain with out removing half the engine first? y would it only do it after 20 mins?

 

any other ideas?

 

this truck is killing me, no i just broke a u joint and the yoke on the front, still got that engine problem

 

[:@]

 

I got a lot of weird bucking and limping when my TPS went but I got the correct code for it, P0121.

There was a small plug in my timing cover, not sure exactly what it is for and whether you could snake a screwdriver in there to check the chain tension or not. It might be covered by the crank pulley. Its the bolt that doesn't look like the others.

 

here's another dumb question, did you reset the PCM when you installed the new Cam sensor?

Is it possible you moved the distributor, knocked the rotor loose or misconnected the plug wires on the cap. Just trying to eliminate the obvious.

 

no , i did not reset the pcm, the engine light went off on its own and drove great for 20 mins again, it even made it thru the taco bell line in town, ....on the way home it started up again,.... so no i didnt reset the pcm , i guess i should start with that, the plug wires , i made sure, clearly marked them , also the cap/rotoe were replaced in dec, so it came apart no big deal , so i dont think i knocked it or moved it

i read to check timing, rotate the fly wheel by hand, and watch for the rotor to move, if ur moving the crank, more than 10 degrees, (using the timing marks on the balancer) then the chain is bad?

 

Yep, that will work to check it. I'd say that there really shouldn't be any play in it. After replacing the timing chain in March on my truck, I couldn't believe how tight it was supposed to be fitting. I had to put the crank gear on with a few light hammer taps to slide it back.

 

forget the timing chain... if it were the problem you'd have problems all the time.
check the crank sensor & the coil. when it heats up and fails, you could spray the coil with a freeze spray to cool it down, if it runs good right after the spray, then swap the coil. you could also do the same for the cranks sensor but it's hard to get to. It might also be more sensitive to being blasted with freeze spray if it's really hot.

 

see , and originaly those were my same thoughts, if it were the timing chain it would happen all the time...i tried a few days ago, using an air hose and a spray bottle of water to cool the coil...im not sure if i cooled it enough? my understanding is that if it were the crank sensor, it would crank over, buy not start.....so when it does get hot, and the motor kills, i can always restart it, so im not sure but it just doesnt sound like the crank senors....im still pondering the bad Cat? maybe try taking out te O2 sensors and taking it for a drive...see if that would releive the pressure