Visit The Dirt Forum for More Information

Author Topic:   Need help ASAP
intimidtr3
Dirt Full Roller

Total posts: 32
posted February 15, 2003 12:51 AM
I just put a 350 in my truck and tried to start it,it cranks a couple times and then blows pressure out the carb.I am not sure the carb is good,but almost positive the motor is.Where should I start?I don't want to buy a carb if I don't need to.The valves should already be adjusted and I know I put the cam and chain on right.Any suggestions would be greatly appreciated.Thanks.

andykmod
Dirt Forum Racer

Total posts: 95
posted February 15, 2003 02:27 AM
check and make sure your timing is not of 180 deg,sounds like it to me

sixwillwin
Dirt Freak

Total posts: 215
posted February 15, 2003 07:49 AM
What andykmod said.......

racer17j
Dirt Forum Champ
Total posts: 1565
posted February 15, 2003 11:37 AM UIN: 54865418
another thing you might want to look at is make sure your balancer hasn't slipped had that happen before .

neverenoughbrew
Dirt Forum Racer

Total posts: 82
posted February 15, 2003 12:18 PM
Yep,sounds like you distributor is installed incorectly. 1)Remove Distributor cap.
2)Mark distributor where #1 on the cap is located.
3)remove #1 spark plug and have someone crank engine while you hold a finger over spark plug hole. When you come upon the compression stroke, it will blow you finger out of the plug hole. NOTE, it will blow you finger out of hole on compression stroke also,but if you crank engine around a couple of times, you will tell the dirrerence. Once you have found the compresion stroke on #1 cylinder, turn Harmonic balancer forward or back slightly until timing mark on harmonic balancer is lined up correctly.
4) re-install sparkplug and wire.
5) install distributor so that rotor points to the #1 sparkplug terminal on distributor cap. Install cap and check that your plug wires are installed in correct order on cap. Clockwise 1-8-4-3-6-5-7-2 Odd # cylinders are on drivers side and even on passenger side of engine. This should have you close in the ballpark to where it will start or the distributor will only need turned very little. On common mistake is that some people beleive when you align the marks on the timing chain and gears this is TDC Compression stroke,but is infact TDC of the exaust stroke causing them to install the distributor 180% out.

intimidtr3
Dirt Full Roller

Total posts: 32
posted February 15, 2003 12:40 PM
I cahnged the distributor 180 degrees and it doesn't blow anymore.It kinda wants to start with different carb,but I am thinking I need to reset my valves since I was 180 out.Correct?I think I adjusted them 180 out so they would all be wrong.You guys are awesome.Thanks for all the help.I was about to give up,but with your help I think I got it licked.Thanks again.

intimidtr3
Dirt Full Roller

Total posts: 32
posted February 15, 2003 04:03 PM
I give up,I can;t get it to start at all.I reset the valves(the way it says on this site) and still nothing.I am lost now.

DEEDDUDE
Dirt Maniac

Total posts: 111
posted February 15, 2003 04:20 PM
3
If you tried everytihing and still doesn't start check the plugs. I had an engine I checked and recheck just wouldn't start. All I had were some old plugs, so I removed 4 from one side and replaced them with some more old plugs and the engine fired, ran real rough. Removed/replaced the other 4 and she fired right up and ran real good. The old plugs looked ok, but were fouling out. Don't give up sometimes it something real simple we over look. Good Luck

jhon hollomon
Dirt Maniac

Total posts: 181
posted February 15, 2003 05:01 PM
Are you sure you did'nt mess with your carb settings when you wre 180 out? Try small turns with your distributor each way till it acts like it wants to start better. You may still be a tooth or three off on the distributer.

Slam_Shifter
Dirt Full Roller

Total posts: 53
posted February 15, 2003 07:32 PM
I wouldn't give up. Sounds like an ignition timing problem to me. If you know you are in the ball park keep the Distributor loose, have a friend turn the key and turn the distributor slowly one way until it fires if it doesn't turn it the other. Once you get it running put a timing light on it and tighten the distributor down. One thing also you didn't say what year truck and what carb but if it is computer controlled some of the early 90's models had a wire you had to unplug to set final ignition timing.

Slam_Shifter

[This message has been edited by Slam_Shifter (edited February 15, 2003).]

intimidtr3
Dirt Full Roller

Total posts: 32
posted February 16, 2003 08:38 AM
It's a 77 350 in a 81 with an Edelbrock 1406 and a high output distributor from Jegs.I think I may have the valves to tight according to a site I found.Thanks

rico 08
Dirt Freak

Total posts: 372
posted February 16, 2003 08:50 AM
try .026-.028 or a little more(that's intake exhaust)that's loode enuf to try it.

champ
Dirt Roller

Total posts: 18
posted February 17, 2003 09:57 AM
If you were backfiring out of your carb when it was 180 out you might check the carb now.

dirtracer7
Dirt Maniac

Total posts: 106
posted February 17, 2003 12:55 PM
sounds like a ignition timing problem put on no 1 tdc and see where your rotor is compared to no1 plug wire.

[This message has been edited by dirtracer7 (edited February 17, 2003).]

intimidtr3
Dirt Full Roller

Total posts: 32
posted February 17, 2003 06:01 PM
Thanks for all the help.It is running good.I had the valves to tight.O well live and learn.Thanks again.

Back to the Archives