Retard the timing and it won't start....Advance the timing and the carb backfires??
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From: Naperville, IL USA
Retard the timing and it won't start....Advance the timing and the carb backfires??
Explain this situation? The subject really says it all.
All the plug wires are going to the right plugs and the distributor has worked in the past...nothing special going on with the ignition at all.
This has happened after a head and cam change on the motor so the compression has raised quite a bit, but I can't see that affecting this at all.
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1990 GTA
-355 carb'd, Richmond 4.10, Auburn posi, Eibach Pro-kit, Koni adjustables all around, Alston SFC's
-150 nitrous shot
-Leather!
-Stereo details coming soon
[This message has been edited by crazeinc (edited June 24, 2001).]
All the plug wires are going to the right plugs and the distributor has worked in the past...nothing special going on with the ignition at all.
This has happened after a head and cam change on the motor so the compression has raised quite a bit, but I can't see that affecting this at all.
------------------
1990 GTA
-355 carb'd, Richmond 4.10, Auburn posi, Eibach Pro-kit, Koni adjustables all around, Alston SFC's
-150 nitrous shot
-Leather!
-Stereo details coming soon
[This message has been edited by crazeinc (edited June 24, 2001).]
Thread Starter
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Joined: Dec 1999
Posts: 528
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From: Naperville, IL USA
I also realized with these new heads I might need a different pushrod length, could that be causing a problem or two? ...or even be the cause of this wierd backfiring problem?
The motor sounds soooo healthy when it's idling with the timing bumped up but as soon as you hit the gas it backfires and when you retard it, the damn thing won't turn over.
The motor sounds soooo healthy when it's idling with the timing bumped up but as soon as you hit the gas it backfires and when you retard it, the damn thing won't turn over.
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Hows lash ?
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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1
Reader's ride -> My Ride
Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1
Reader's ride -> My Ride
Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
Thread Starter
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Joined: Dec 1999
Posts: 528
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From: Naperville, IL USA
****...my buddy just informed me that I'm using a 305 balancer so the timing marks are way the hell off so that part is fixed thankfully BUT
NEW PROBLEM:
The pass. header is turning bright red due to a lean condition. My friend is saying it's because of a vacumm leak somewhere. It's not any of the brake lines, pcv, or dist vaccum, so he was saying the heads and intake may not be aligned properly if the heads have been decked too much. Please tell me there's another explanation for the lean condition.
Someone suggested trying a different spark plug, but somehow I doubt it will be that easy to fix.
NEW PROBLEM:
The pass. header is turning bright red due to a lean condition. My friend is saying it's because of a vacumm leak somewhere. It's not any of the brake lines, pcv, or dist vaccum, so he was saying the heads and intake may not be aligned properly if the heads have been decked too much. Please tell me there's another explanation for the lean condition.
Someone suggested trying a different spark plug, but somehow I doubt it will be that easy to fix.
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From: Kempner,TX,
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07
<font face="Verdana, Arial" size="2">Originally posted by crazeinc:
****...my buddy just informed me that I'm using a 305 balancer so the timing marks are way the hell off so that part is fixed thankfully BUT
NEW PROBLEM:
The pass. header is turning bright red due to a lean condition. My friend is saying it's because of a vacumm leak somewhere. It's not any of the brake lines, pcv, or dist vaccum, so he was saying the heads and intake may not be aligned properly if the heads have been decked too much. Please tell me there's another explanation for the lean condition.
Someone suggested trying a different spark plug, but somehow I doubt it will be that easy to fix.</font>
****...my buddy just informed me that I'm using a 305 balancer so the timing marks are way the hell off so that part is fixed thankfully BUT
NEW PROBLEM:
The pass. header is turning bright red due to a lean condition. My friend is saying it's because of a vacumm leak somewhere. It's not any of the brake lines, pcv, or dist vaccum, so he was saying the heads and intake may not be aligned properly if the heads have been decked too much. Please tell me there's another explanation for the lean condition.
Someone suggested trying a different spark plug, but somehow I doubt it will be that easy to fix.</font>
Put a vacuum gauge on the engine see what reading you have. Reading should be steady with no sudden dips.
Use the old 'water spray bottle" technique or an "UNLIT" propane bottle to check all the possible locations for sucking vacuum. If the idle suddenly changes when you direct the water/propane at a certain spot, you've found your leak.
Check all the vacuum hoses, especially the underside. If any are brittle, replace them. Don't forget the one on the underside of the TB ("Y" bodies have 'em so I'm supposing "F" bodies do too).
Hope this helps.
Jake
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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9
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