Engine Help Please! - Team Camaro Tech
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post #1 of 21 (permalink) Old Oct 8th, 09, 07:52 PM Thread Starter
Gary
 
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Engine Help Please!

Ok, I just installed a 350/400HP crate engine and cannot get it to run right. It idles ok, but when you put it in gear it it pings and diesels when you shut it off. Also, when you stomp on it ther's a dead spot, it runs ruff and even backfires sometimes. The smell coming out of the exhaust is eye burning strong. The timing is all seems to be set correctly. Any suggestions anyone? Thanks, Gary
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post #2 of 21 (permalink) Old Oct 8th, 09, 08:08 PM
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Re: Engine Help Please!

The pinging is likely a timing issue. The dieseling is likey a carb issue (throttle blades too open at idle) which could be symptom of bad timing.

Tell us how you set the timing?

Also, is it possible the harmonic mark and the pointer on the timing cover are a mismantch?
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post #3 of 21 (permalink) Old Oct 8th, 09, 08:13 PM Thread Starter
Gary
 
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Re: Engine Help Please!

The timing is set at 32 degrees at 3000 rpm, which is what they said it supposed to be set at. I suppose it's always possible that the mark is wrong, but supposedly it was set and dialed in before I got it.
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post #4 of 21 (permalink) Old Oct 8th, 09, 09:08 PM
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Re: Engine Help Please!

It sounds like the distributor is off a tooth. Was it already installed when you got it.

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post #5 of 21 (permalink) Old Oct 8th, 09, 09:13 PM Thread Starter
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Re: Engine Help Please!

Yea, it was installed when I got it. Not sure if the guy who installed the motor pulled it out or not. I'm a little upset with him right now and not sure if he would even be honest with me.
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post #6 of 21 (permalink) Old Oct 8th, 09, 09:18 PM
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Re: Engine Help Please!

i had to change the springs on my distributor to get it to advance the vacumn and idel right, its a timing issue..

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post #7 of 21 (permalink) Old Oct 8th, 09, 09:43 PM
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Re: Engine Help Please!

First thing is to double check the timing your self. Then like knightmoose said the springs in the advance may be coming in to early and at idle its bouncing in and out. You should see this with a timing light..... Then adjust your idle down and check your float levels and adjust your fuel mixture screws then set your idle for best idle.

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post #8 of 21 (permalink) Old Oct 15th, 09, 08:00 PM
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Re: Engine Help Please!

Where is the crate engine from ?
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post #9 of 21 (permalink) Old Oct 15th, 09, 11:21 PM
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Re: Engine Help Please!

If it's a 350 with 400hp it likely has a pretty decent cam, which means you need to do some serious timing work, initial, curve, total, and vacuum advance.

Take the cap off, turn the motor to COMPRESSION stroke on the #1 cylinder, and post back where the distributor is pointing. It is VERY easy, even for us big time gear heads to be one tooth off, I bet it is one tooth retarded from what you posted.

If it's not, disconnect the vacuum advance, set initial timing to 16*-20*, re set idle speed, and go from there, don't worry about the vacuum advance if it's equipped until you figure this out, that's a whole different story.

Your total timing can still be correct, even though you are a tooth off.

One way to tell if you are a tooth retarded is advance the distributor A LOT and see if it idles any better, if it does, you are at least a tooth off.

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post #10 of 21 (permalink) Old Oct 16th, 09, 11:27 AM
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Re: Engine Help Please!

Is the firing order correct?

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post #11 of 21 (permalink) Old Oct 16th, 09, 01:36 PM
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Re: Engine Help Please!

I would shoot for 36-38 degrees advance on your timing... Its also very possible that during shipping that the timing could have been disturbed if the engine got knocked hard or dropped....How much play does the rotor have in it?

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post #12 of 21 (permalink) Old Oct 16th, 09, 02:23 PM
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Re: Engine Help Please!

Where does this "one tooth off" nonsense come from? You can time a car perfectly regardless of where the distributor is dropped. Which gear is engaged when the dist is dropped, isn't relevant. Timing is the relationship of the cap to the rotor.

Last edited by Straight-line-69; Oct 16th, 09 at 02:45 PM.
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post #13 of 21 (permalink) Old Oct 16th, 09, 03:05 PM
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Re: Engine Help Please!

Quote:
Originally Posted by Straight-line-69 View Post
Where does this "one tooth off" nonsense come from? You can time a car perfectly regardless of where the distributor is dropped. Which gear is engaged when the dist is dropped, isn't relevant. Timing is the relationship of the cap to the rotor.
Basically you are saying if I go out to my car and pick up the distributor, and move it one tooth over, it will run perfectly fine?

It doesn't matter where the rotor is pointing (many of us like it pointing to the #1 though), as long as the #1 is at TDC on the compression stroke...

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post #14 of 21 (permalink) Old Oct 16th, 09, 04:00 PM
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Re: Engine Help Please!

Quote:
Originally Posted by Straight-line-69 View Post
Where does this "one tooth off" nonsense come from? You can time a car perfectly regardless of where the distributor is dropped. Which gear is engaged when the dist is dropped, isn't relevant. Timing is the relationship of the cap to the rotor.
most people like to keep it correct and put the number one plug wire where it belongs on the cap

i have just dropped the distrib in before and fired the engine up, ut i always went back and corrected it
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post #15 of 21 (permalink) Old Oct 16th, 09, 04:06 PM
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Re: Engine Help Please!

Quote:
Originally Posted by ace's68 View Post

Your total timing can still be correct, even though you are a tooth off.



What? That only has to do with the position the dist is in. Timing is timing.

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