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Slight rolling idle and a little rough at tickover

Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=30282
Printed Date: October-09-2024 at 1:33am


Topic: Slight rolling idle and a little rough at tickover
Posted By: Alcarlaw
Subject: Slight rolling idle and a little rough at tickover
Date Posted: June-15-2013 at 6:55am
My GT40 has developed a slight rolling idle and also seems to run a little rough under load at low rpm ( and I mean slight on both counts, if I didn't know the engine I wouldn't think anything was up with it.
Watching the rpm gauge on the Perfect pass, the change in rpm is minimal, 30-40rpm but you do feel the engine hesitate and judder slightly, it just doesn't feel as smooth as it should. I've already replaced the relay to the ECM and the idle air control valve so my next plan is to replace the hose inside the FCC just in case it has developed a crack. Question, as I replaced the FCC filter not too long ago so it doesn't need replaced, is it an absolute no no to open the filter can to replace the hose and not change the o-rings??

If it comes to it, I'll just purchase a new filter and o-ring but they are a little tricky to come by in the UK and are expensive.....

If this doesn't provide a fix, would it be worthwhile changing the plug leads, maybe one is starting to break down.



Replies:
Posted By: bigwavedave
Date Posted: June-15-2013 at 10:56am
I'm having a same problem with my 95 GT 40 I'd appreciate if you let me know how to fix Thanks Dave

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bigwavedave


Posted By: lewy2001
Date Posted: June-15-2013 at 10:53pm
Guys this old thread on http://www.correctcraftfan.com/forum/forum_posts.asp?TID=24848&PN=1&title=gt40-engine-loping" rel="nofollow - GT40 Rolling Idle (loping) should give you a good start.

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Posted By: Alcarlaw
Date Posted: June-17-2013 at 7:21pm
Thanks levy, I read that post with interest when I was initially diagnosing the problem. I've gone ahead and changed the hose in the FCC, it looks like the hose was past its best. I didn't change the filter or o-ring so need to pay close attention to ensure the FCC canister doesn't develop a leak.



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