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Old 04-12-2021, 11:19 AM   #1
snow_bound26
Scooby Specialist
 
Member#: 395793
Join Date: Jul 2014
Chapter/Region: Tri-State
Location: SLC and Lake Placid
Vehicle:
2005 92x Aero
Beige

Default Stumbling issue v7 207

Apologize for length. Just trying to be thorough. Need some help. Tried posting this in the 207 info thread as well. No response.

Started off having an issue with high rpm hesitation/stumbling about 6-7 weeks ago. Basically engine did not want to rev past 7200. After getting some initial feedback of "it's your ignition coils", I went and replaced them with new ones. Previous ones had about 20k miles on them and were OEM. Put in new ones and new crank position sensor last week. Problem still there.

This morning I go to start the car and it didn't want to to fire up. Sputtered for a few seconds then reluctantly started to run. Let it idle for about 10 min which got smoother as it warmed up as I was listening from inside the house. Went to get in the car and could smell a little gas. Have had an issue with one of my clamps on the feed line coming loose so grabbed my screw driver to tighten it. Tight. Hadn't loosened up at all. Get in the car and give it a little gas to bring it up to 1500 and it sounds rough. Let foot off throttle and it wanted to stall. Gave it a few seconds and tried again and this time was fine. Decided to take it down the road a little and see what happens. Sounds rough, not the usual smooth I'm use to with this engine.

What should I be looking for? FPR? Cam position sensor? Wiring?

The following were done last fall when I finished up installing the 207:
New NGK BKR7EIX gapped to .028"
New walbro 255
New ID 1050x injectors
Older version Perrin fuel rails w/new fuel lines
2 new injector plugs on wiring harness
73mm KS intake
New silicone vac lines
Cleaned MAF sensor - about 20k on it
Tuned on 91oct - goes a tad rich at 7000, not sure why
New OEM flywheel
AVCS was working properly at time of tune

Replaced last week:
CPS part #22053AA053
Ignition coils part #22433AA561

Checked plugs while I was in there. Plugs were clean and didn't show any signs of burning rich/lean. Gaps still at .028".

Have since found conflicting info on what plugs I should be using. Tuner had me use heat range 7. Engine had heat range 8 when I purchased it. Info that I've found on the forum has stated both heat range 6 and 7 from the factory. Am wondering if this could be causing part of my high rpm issue (the rich condition at 7000)? Am thinking FPR could be the main source of high rpm stumbling and now the over all rough idle/driving that I felt this morning.

Letting the car cool down and going to check all my vac lines. Did recently install GrimmSpeed AOS, but that was about a month ago and the high rpm issue was present before that and didn't have any changes in start up or idle after install.
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