help! I screwed up, and need suggestions.....

66fastback · 07-20-1999, 05:42 AM

and I don't mean about where to stick the camshaft. I tried to start up the new engine and all it did is puff-puff-backfire-puff-puff-backfire--etc.

I'm not new at this, and I'm lost as to what I might have missed or done wrong. The engine is a 5.0 (351W firing order) and I've tried rephasing the plug wires 180 degrees, advancing/retarding the timing, and even the 289 firing order on the slim chance they ground the cam to the wrong firing order--which I would have caught when I set the lifter preload.

So far all I can think of is

1. I might have crossed the wires on the duraspark unit. I think that could cause this problem....

2. Maybe I set the lifter preload too tight, and the valves aren't seating. This doesn't seem very likely, I've done this MANY, MANY times.

That's all I can come up with....if anyone has any ideas, I'm willing to listen. This is embarrassing for me, I've never had one that didn't fire off in the first 10 seconds before....Thanks for any ideas, good, bad, or just plain crazy.

------------------
66 GT Fastback 5.0, 5-speed, 3.40 gears, Fuel Injection soon

07-20-1999, 05:42 AM	#1
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	help! I screwed up, and need suggestions..... and I don't mean about where to stick the camshaft. I tried to start up the new engine and all it did is puff-puff-backfire-puff-puff-backfire--etc. I'm not new at this, and I'm lost as to what I might have missed or done wrong. The engine is a 5.0 (351W firing order) and I've tried rephasing the plug wires 180 degrees, advancing/retarding the timing, and even the 289 firing order on the slim chance they ground the cam to the wrong firing order--which I would have caught when I set the lifter preload. So far all I can think of is 1. I might have crossed the wires on the duraspark unit. I think that could cause this problem.... 2. Maybe I set the lifter preload too tight, and the valves aren't seating. This doesn't seem very likely, I've done this MANY, MANY times. That's all I can come up with....if anyone has any ideas, I'm willing to listen. This is embarrassing for me, I've never had one that didn't fire off in the first 10 seconds before....Thanks for any ideas, good, bad, or just plain crazy. ------------------ 66 GT Fastback 5.0, 5-speed, 3.40 gears, Fuel Injection soon