Haven't been able to nail this down
05-16-2014, 10:44 AM
#22
Hi.
When you say no CEL, this still does not mean that there are no codes. Pending misfire codes, for example, do not set a CEL but are presetn, requiring a scanner capable of reading them. trans codes are the same - generic, basic code readers can't pull these.
Before suspecting the trans, and to avoid frustration chasing unidentified misfires, you need to determine if it is indeed a specific cylinder ( or cylinders ) misbehaving, and proceeding appropriately. That means codes are needed.
Otherwise, you would need to shotgun the entire set of COPs - an expensive proposition. And what if the intermittent issue is still there? With a code you can move the COP to see if the code follows - thereby isolating it to COP, plug or even injector - using the same 'move-and-check' procedure.
If all of those components are ruled out (assuming you have a cylinder identified), then the next place to look is the valvetrain (cam follower, etc), and further, into the cylinder itself (compression test, borescope, etc).
It all starts with identification - a sometimes protracted effort given the intermittent nature.
I'll defer further comment on the trans - I think you'd need a professional opinion ( and diagnostics) regarding that if no hard trans codes are present. Sorry.
good luck
MGD
When you say no CEL, this still does not mean that there are no codes. Pending misfire codes, for example, do not set a CEL but are presetn, requiring a scanner capable of reading them. trans codes are the same - generic, basic code readers can't pull these.
Before suspecting the trans, and to avoid frustration chasing unidentified misfires, you need to determine if it is indeed a specific cylinder ( or cylinders ) misbehaving, and proceeding appropriately. That means codes are needed.
Otherwise, you would need to shotgun the entire set of COPs - an expensive proposition. And what if the intermittent issue is still there? With a code you can move the COP to see if the code follows - thereby isolating it to COP, plug or even injector - using the same 'move-and-check' procedure.
If all of those components are ruled out (assuming you have a cylinder identified), then the next place to look is the valvetrain (cam follower, etc), and further, into the cylinder itself (compression test, borescope, etc).
It all starts with identification - a sometimes protracted effort given the intermittent nature.
I'll defer further comment on the trans - I think you'd need a professional opinion ( and diagnostics) regarding that if no hard trans codes are present. Sorry.
good luck
MGD
05-17-2014, 12:30 PM
#24
Ok awesome! Thanks for the info! The guy at my transmission shop says he has a machine that can test for misfires and other codes and if it's the transmission he'll gladly check into it. I plan on running my truck over to him at some point this week and hopefully it's just one COP that's bad so I can get it replaced fairly inexpensively. He said it would cost $100 to run the diagnostics and it's the same machine Ford uses, is that a fair price? I'll keep you updated and again, I appreciate all the info.
Last edited by JsHwrdul; 05-17-2014 at 12:40 PM.