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#1701996 - 12/09/09 07:21 PM Car runs rough at idle
DreamerGT Offline

Registered: 07/09/09
Posts: 370
Loc: austin,tx
This is the code I get. P0352 Ignition Coil Primary B / Secondary Circuit Malfunction, all the cops(coil on plugs)are new about 8 months old and the spark plugs were replaced a year ago. I starts fine, its when its idling at a stop light or whatever it will go rough. But when I start driving it will drive rough for a little bit, then snap out of it and drive fine and have full power again. Any idea's? thanks
02 Ford Mustang GT,5w-30 Royal Purple, Redline D4
15 Ford Focus ST 5w-30 MC

#1702026 - 12/09/09 07:38 PM Re: Car runs rough at idle [Re: DreamerGT]
tig1 Offline

Registered: 01/03/09
Posts: 12755
Loc: Illinois
When the engine starts to idle rough pull over to a stop, leave the engine running and place a cloth up to the tail pipe. Don't completly close the pipe off but leave a slight gap between the pipe and cloth. If there is a miss it will suck the cloth up to the pipe with every miss fire. Ignition problem. It will make a pop pop sound with the miss. If no miss then look else where for your idle problem. Injector etc.

Edited by tig1 (12/09/09 07:40 PM)
2007 Ford Fusion 213,000 miles
M1 0-20 AFE
2017 Ford Fusion 33K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

#1702401 - 12/10/09 01:54 AM Re: Car runs rough at idle [Re: tig1]
mechtech2 Offline

Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
He already states that there is a miss.
Why check for it at the tailpipe? - that is silly.

Can you quickly disconnect power to each coil when it is misfiring?
A good coil/plug will show even worse, and a bad one no change.

Even though an ignition code is being thrown, it may be a vacuum leak or fuel delivery problem. Maybe even an EGR thing.
Sometimes computers give codes for left handed reasons.

#1702418 - 12/10/09 02:49 AM Re: Car runs rough at idle [Re: mechtech2]
mechanicx Offline

Registered: 10/23/09
Posts: 8576
Loc: Ohio
I think that means there is a problem at coil number 2 or b. What kind of plugs and coils did you use as replacements? You might want to check the wiring harness to that coil.

#1703260 - 12/10/09 06:16 PM Re: Car runs rough at idle [Re: mechanicx]
DreamerGT Offline

Registered: 07/09/09
Posts: 370
Loc: austin,tx
I got the coils off of ebay. Non oem all 8 for $70 and the plugs are standard motorcarft plugs. I will check the wiring harness and see what I come up with.
02 Ford Mustang GT,5w-30 Royal Purple, Redline D4
15 Ford Focus ST 5w-30 MC

#1703268 - 12/10/09 06:20 PM Re: Car runs rough at idle [Re: DreamerGT]
mechanicx Offline

Registered: 10/23/09
Posts: 8576
Loc: Ohio
Also if possible I think you could swap coils and if the problem moves with the coil you know that's it. Or maybe you could check the coils primary and secondary resistance against specs.

#1703366 - 12/10/09 07:37 PM Re: Car runs rough at idle [Re: mechtech2]
Gary Allan Offline

Registered: 09/28/02
Posts: 39806
Loc: Pottstown, PA
Maybe even an EGR thing.

That would produce a rough idle that totally evaporated in the upper power levels.

If you have a vacuum actuated EGR, then pull the hose off of the supply side and apply vacuum (suck on it). If the engine stumbles ..then it's probably closed like it should be. If nothing happens then it's probably stuck.

#1704879 - 12/12/09 08:32 AM Re: Car runs rough at idle [Re: Gary Allan]
another Todd Offline

Registered: 05/15/06
Posts: 2157
Loc: Lakeside CA
Good point Gary.
2015 Ford F250 Diesel Crew Cab FX4
2017 Ford Escape 2.0
2002 GMC Yukon
2015 Hyundai Accent
2008 Yamaha Rhino 700 FI