Items I've replaced : Crank position sensor neutral safety switch ignition module fuel filter fuel pump ignition coil no code is being displayed , some times the check engine light comes on then the motor will miss fire and the light goes out , it normally happens at about 60 mph any advice would be great.
my engine starts missing badly after it warms up. on 1999 Chevrolet Express 1500
by gphvac in Lockhart, TX on May 23, 2013
2 answers 4 comments
ANSWER by pushrod on May 23, 2013
Plug wire(s) breaking down. Distributor worn, check for shaft play side to side.
COMMENT by gphvac on May 24, 2013
Looks like that was the problem , I didn't feel like there was excessive wear in the distributor shaft there is a definite improvement in the way the motor runs , there is no longer a miss in the motor after warming it up or running it at 60 mph like before I replaced the distributor and the spark plug wires. thank you very much.
COMMENT by pushrod on May 24, 2013
You bet! Should be near 0 play in the shaft horzionally. Glad you got it fixed! One more suggestion, like greg ask, crank relearn really needs to be performed! Also timing should be set, both need to be done with a scanner hooked up, make sure oil is full as rpm will be raised with relearn! Removing the dog house when you get to the shop will save you a little money. This is if you can't do these resets yourself. Need a scanner!! Now IF it is running just like it should you may have got lucky and have it in correct time and relearn was done by the computer but if the light is on or flashing those things really need to be done for top performance. Well even if light is not on needs to be done, it will bring it back to life + better MPG!
COMMENT by gphvac on May 26, 2013
Thanks again, I think I might have right because it runs better than it's ever ran, I have thought about getting a scanner to set the timing, I don't mind taking it to the shop but I never know who's going to work on it, and it usually takes days to get it back, can you recommend a scanner that can do the job and maybe one that won't break the bank?
COMMENT by pushrod on May 26, 2013
If it is running good with the power it should have, no check eng. light then dont try anything else! Drive it awhile and see what it does. Now, if C.E.L. is on get zone or advance to scan it for you, post codes and we will help more! Dont have to be done with a scanner, it is just more accurate. Glad to help! Oh yea, a scanner that will do this is not for a diy. Too much money for the average man unless using it daily. If you do take it to a shop ask if they can do this before getting it done!! Good chance the shop around the corner can't. If you know what i mean.
ANSWER by globalhelper on May 24, 2013
agree with pushrod. did you relearn new crank sensor. seek relearn procedure on wwwalldatadiy.com