The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Hard start & poor off-idle acceleration

NoNeck · 03-08-2011, 10:25 PM

Before I pulled the intake off, I would start the engine and spray carb cleaner or WD-40 around the intake. If the engine rpm speeds up at any point, that would indicate a vacuum leak.
Also, some generic, cheapo intake gaskets don't completely seal under 4 critical "ears" on the intake.
I always use a hefty seam of RTV for the front and end seals and throw the cork (or rubber ones) away.
It also sounds to me that your timing is too high... maybe you re-installed the distributor a tooth or two off, which would give you a false reading on the timing light. Sometimes it's better to tune it by ear, using a vacuum gauge to get the max vacuum, disregarding what the timing light indicates.
Just me...

NoNeck

03-08-2011, 10:25 PM	#11
NoNeck Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 1,106	Re: Hard start & poor off-idle acceleration Before I pulled the intake off, I would start the engine and spray carb cleaner or WD-40 around the intake. If the engine rpm speeds up at any point, that would indicate a vacuum leak. Also, some generic, cheapo intake gaskets don't completely seal under 4 critical "ears" on the intake. I always use a hefty seam of RTV for the front and end seals and throw the cork (or rubber ones) away. It also sounds to me that your timing is too high... maybe you re-installed the distributor a tooth or two off, which would give you a false reading on the timing light. Sometimes it's better to tune it by ear, using a vacuum gauge to get the max vacuum, disregarding what the timing light indicates. Just me... NoNeck __________________ 2016 RAM Laramie HEMI 1966 Fairlane GT/A, 390/335 HP If it costs you a dollar to make a friend, KEEP THE DOLLAR. If it costs you a friend to make a dollar, KEEP THE FRIEND. Last edited by NoNeck; 03-08-2011 at 10:28 PM.