firing problems

[adamforsythe]

I have a 1985 K5 Blazer with a NEW 350 4 bolt engine. I just put a new intake on it. Well I got everything back together and went to start it and I am getting a popping sound.
What is going on?
Thanks
Adam

 

[pauly383]

Timing is of more than likely . Find TDC , with the cap off see where the rotor points , then go from there around 1-8-4-3-6-5-7-2 , even plugs on pass side odds on drivers side . Get it real close and it should fire and run so you can afjust it /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif

 

[dyeager535]

Got an inductive timing light?

Absolute favorite trick for starting it up first time is to find TDC (pull all plugs, put finger over #1 cylinder, turn engine over by hand until it starts blowing air past your finger, stop cranking when it stops, (make sure balancer mark is on 0) re-install plugs (or just #1 plug, your choice) hook up timing light to #1 plug wire, turn key to run, rotate distributor until the timing light fires. If everything else is working right, it WILL fire on the first attempt now.

 

[adamforsythe]

I will play with it in the morning.
Thanks
Adam
/forums/images/graemlins/hack.gif /forums/images/graemlins/screwy.gif

 

[nomo4x4]

IF you get the distributor exactly set at the #1 TDC you still have a 50/50 chance, it could be on the exhaust stroke instead of the power stroke meaning its 180 degrees off, if this happens get it back to where you started at #1 TDC and reinstall the distributor with the rotor pointing at the number 6 plug wire instead of the number 1...You'll be set. Good luck!
Zak

 

[adamforsythe]

I will try that.
I will check back with you guys soon and tell you what is going on.
Thanks
Adam

 

[adamforsythe]

[ QUOTE ]
IF you get the distributor exactly set at the #1 TDC you still have a 50/50 chance, it could be on the exhaust stroke instead of the power stroke meaning its 180 degrees off, if this happens get it back to where you started at #1 TDC and reinstall the distributor with the rotor pointing at the number 6 plug wire instead of the number 1...You'll be set. Good luck!
Zak

[/ QUOTE ]

Hello,
I did that and the truck started but it ran like crap. The engine was also getting a lack of fuel so I would have to hit the gas to keep it running.

ALSO for some reason I moved the distributor back to number 1 plug and the truck was popping again. Well I got the truck back to TDC and moved the distributor back to 6 plug and the popping is still going on.
Well after playing with it I got the distribitor to poning to plug number 1 when the engine is at TDC and I am still getting the popping.
Thanks
Adam

 

[semper-k-five]

what sort of "popping" sound r u talkin about??? a backfire "pop"?? Through the exhuast or intake?

 

[adamforsythe]

Af first it was the exhaust now I am getting a intake pop.
The truck is running but I have to keep giving it gas to keep the truck running. plus it runs rough.
Thanks
Adam

[ QUOTE ]
what sort of "popping" sound r u talkin about??? a backfire "pop"?? Through the exhuast or intake?

[/ QUOTE ]

 

[semper-k-five]

if ur using a carb, it sounds to me like it's not tuned right....have to keep the throttle up to keep in runnin and such....i don't have the URL on me, but do a Google search for "vaccum tunning"...that will give you step by step how to use the vac gauge to both time and tune ur motor...it's the most thurough and accurate tunning style that i know of...

If ur TBI/TPI, then that's a whole nother story...but it definetly sounds like a tune issue...

 

[adamforsythe]

Hello,
It has to be the distributor (timing) because a vacuum problem would not make a truck sound so loud.
Thanks
Adam

 

[semper-k-five]

i think i confused you on the vac tuning....what's going to happen, is ur gonna buy a regular automotive vaccum gauge from autozone or sears, connect it to an avail port on ur intake, and perform some dist setting steps and carb tuning steps...an engine is basically a high tech vaccum cleaner...using the vac gauge allows you to set the motor at the optimum vaccum...vaccum is established with both the correct timing a correct air/fuel mixture....

Again, type vaccume tuning in google and you can find some great info listing the steps you need to perform....

 

[adamforsythe]

[ QUOTE ]
i think i confused you on the vac tuning....what's going to happen, is ur gonna buy a regular automotive vaccum gauge from autozone or sears, connect it to an avail port on ur intake, and perform some dist setting steps and carb tuning steps...an engine is basically a high tech vaccum cleaner...using the vac gauge allows you to set the motor at the optimum vaccum...vaccum is established with both the correct timing a correct air/fuel mixture....

Again, type vaccume tuning in google and you can find some great info listing the steps you need to perform....

[/ QUOTE ]
Hello,
I think my engine has a vaccume leak. I will buy a gauge and go from there.
Thanks
Adam

 

[zeroz400]

Make sure your 5 and 7 plug wires are not mixed up. If you have to keep the pedal down then you may be off by one tooth.


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