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Author Topic:   Running rough
Clevo377
Gearhead

Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 11-19-2001 04:26 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
Just a quick one. I have a 351 that is running rough at idle. Pulling the No.1 plug makes no difference to the idle. Compression is OK. At speed it's ok, no apparent loss of power.
What do you think, intake leak???

Paul

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Fastback68
Gearhead

Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 11-19-2001 05:18 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
Erm, I probably know less about engines than anyone else in M&M, so here I am setting myself up for a fall You say that pulling a plug makes no difference to the idle. In my book, that means the plug is no good ... doesn't it???

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franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 11-19-2001 09:51 AM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
Bad plug
bad plug wire,
broken valve spring
broken rocker arm/pushrod problem,
burnt valve/seat

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Clevo377
Gearhead

Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 11-20-2001 04:28 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
Thanks guys, have checked the springs/rockerarms. ok. swapped plug wires (but not plugs....must try that) no difference. If it was a valve wouldn't a compression test show it up?

Aside from the plug, any other ideas??

Paul

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lyle29464
Gearhead

Posts: 827
From: Mt. Pleasant S.C.
Registered: Mar 2000

posted 11-20-2001 08:03 AM     Click Here to See the Profile for lyle29464   Click Here to Email lyle29464     Edit/Delete Message   Reply w/Quote
My guess is fuel air mix at idle

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Clevo377
Gearhead

Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 12-24-2001 03:32 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
Fixed it The inlet manifold was not down tight and the gasket had seperated and was being pulled into the ports. Number one and three were half blocked off .

There was obviously a vacuum leak there as well. Replaced the gaskets and she's as smooth as silk (except for a slight cam lope )

Paul

[This message has been edited by Clevo377 (edited 12-24-2001).]

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