This is topic Running ruff when cold. in forum Tech Talk at Northern California Ford Owners .
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Posted by jp (Member # 8045) on
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Well as of late my car has been running really ruff when it's cold. This is not my dd so it doesnt get alot of driving time. Last saturday I started it to take it for a drive and it was idling real ruff like a fouled spark plug. So I pulled all plug's and they look great. All tune up part's have 300 miles on them since i have swaped the the intake to a tfs upper and lower. All sensors have been replaeced by one reason or another. with in the last three month's I have replaced the tps,o2 sensors egr valve and postion sensor , baro sensor, coolant temp sensor,maf and done the ten pin cleaning .As the motor warm's up it seems to smooth out and run pretty good. I have also replaced fuel pump and the injector's as well as Iac all but Iac are all ford factory part's. I thought last night it was probley my intake charge sensor since it handles fuel enrichment while vehicle is cold so I got a new one from napa and it is a plastic piece of crap butt I put it in any ways. So my question is with all that I have replaced for one reason or another is this some thing in my motor or is this electrical? I have good compression all cyl above 140 and 5 pounds within eachother and all new tune up parts including coil which is msd. Timming set at 12 btdc. Any suggestion's are welcome thank's.
Posted by SmokinLX (Member # 1684) on
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Need to scan codes from the computer to narrow thing's down.
Posted by jp (Member # 8045) on
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I have pulled codes my snap on scanner says no codes are preasent. There is a history code from a nuetral safety switch but that would not effect the wat the car is running. That is were Iam at no codes and the ruff idle while cold is there also the cel light has never came on.
Posted by Thirteen Twenty (Member # 7961) on
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check vaccume? stuck egr? or vaccume leak
Posted by jp (Member # 8045) on
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I have 14 pounds of vacum at idle and I have checked them double checked for vacum leaks. I replaced all rubber lines when doing the intake swap. I replaced the egr valve with a new ford one but I have taken it off and double checked for carbon. I have also checked every sensor for proper voltage and checked them with my ohm meter and that the signals from every sensor is making it back to the computer. Has any one had a problem with the injector wiring harnes?? Thank's for the input keep them coming maybee some can think of some thing that I have not checked yet. I have checked all the simple stuff already.
Posted by Blind (Member # 3052) on
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it may be the 10 pin connectors that join the injector harness to the ecu harness, I'd pop them off, clean out with electronics cleaner spray, spread the pinned connectors with a punch, coat with dielectric grease and re-connect and see how that works.
also I would suggest if you don't already have one, adding a ground from the engine block to one of the front sway bar bolts on the frame rails might be a good idea, your ground might not be strong enough?
Posted by jp (Member # 8045) on
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Will try both I have done the ten pin connectors before and I will do them agian. And i will add another ground first thing tommorow and repart back.
Posted by jmcclesk (Member # 1355) on
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turbo50 did a post with a link for a idle problem caused by a netural safty swtich. I have a break out box if you need one.
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