After I got my new cam in (comp 262) w/ new lifters adjusting the way comp said. I got it all put back together and it wouldn't start. I got #1 up and it was out 180. I looked where #1 was at that time and timed from there. It cranked right up but it constantly is backfireing through the carb just a little backfire but like every rotation. I adjusted the distribitor and it either gets a little better are worse and dies. I don't know if my timing my be off a plug are two on the dist. Are if I may have got my lifters two tight. Any suggestions would be great at this point. I have a 295/350 its stock all but the cam and I put a stealth intake on when I changed the cam. Its got a holley on it. It ran fine before the cam swap but I don't know what size the carb is. Thanks for any help.

Shane
68 Camaro

I would start over with making sure that you were on the compression stroke when you dropped the distributor in. After you have found that you are on the compression stroke and the distrbutor is in and pointing to #1 then check the wires on the cap to each plug. Firing order 18436572

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68 RS, Ash Gold,pwr windows,Hounds tooth

Sweems,

I think you are on the right track here but have you checked to see if mabe it is cross wired.

A lifter may be to tight but normally a back fire is caused by a valve that is not opening or cross wired.

If you have a question about firing order and such I posted that on another post. I will go and see what it is under and come edit it in here.

The other post is under; Engine & drive train, Firing order.

Larry


[This message has been edited by lnjstreetrods (edited 10-21-2000).]

Hello there Sweems, Don't you just hate when things don't go as planed? My day has been like that but it did get better. Anyway,Like Larry and 420 said, it may be a crossed wire( I do it from time to time) Is the cam straight up? I have a valve tightening sequence chart that only requires turning the engine over one revolution in the process. I could e-mail that to you. It is handy. I would just back off the valves after bringing the motor to TDC at 1 or 6. Then recheck the cams installed center. You can use the rockers to see that. Just remember to in no way allow the engine to go toidle during the first 20 min. or so. Shut it down from up where it is if need be. Also, maybe check that the intake or carb. doesn't have a large leak. Maybe an open hole. Just a few thoughts. I know those days well and I sympithise with you, I put a 421 sb in a buddys nova this morning, and again this afternoon, Why is unimportant, I was having a bad day maybe. Gotta blame it on something. Galen

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S/B Chevy Lover
67 Camaro street car
10:50's @ 128 on motor w/383 cid
79 Z28 w/383 9.1:1 3.73:1 Restoring stock apearance
13:40's @ 101 stock exh.& intake& Qjet
smog legal
Camaro Lover

I just made a quick run through yesterday when I found it was 180 out. I will check for the cross wireing. Also if Galen could email me that valve tightening guide I will try it to if everything else seems ok.

Thanks for all the help I'll let you know how it goes after I work on it after church today.

Thanks
Shane

Ok guys I missed the exhaust valve on #8 when I was adjusting the lifters. Got that right and it fired up and didn't backfire at all. Broke the new cam in checked for leaks and went to the store for gas and a test drive. I left my rode and laid about 150' of rubber then it laid down and died. I costed to the store (only 3/4 of a mile) put gas in it and it wouldn't start. Checked the dist. and it had moved advance on me. I didn't have it tight enough. Moved it back and came home. Got on my rode and nailed it again and it hit about 4 grand and died with a poof. Moved the dist. and limped home, tinkered with it to get it advanced enough to start but not ping. I haven't went for a drive since but its about in the same spot as before what could be causeing this. Please help its not going well at all.

Thanks
Shane

Shane,

Check your distributor hold down, some times it will slip and only one side will catch and even if you tighten it the dist still moves.

If this persist there most be something wrong with the dist, because there is nothing inside it to cause it to move around.

Larry

I second that. Make sure you have the correct distributor hold down, and that it isn't bent or something. Way to break in your new cam!
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Matt
http://camarotech1.com
Camaro Tech 1st Generation

[This message has been edited by houndog72 (edited 10-22-2000).]

hey if it is still back firing it is probably your plugs mine also done that i got a 400 smallblock in a 79 camaro and we also put a comp cam with 490 lift when we fired it up plugs were crossed but didnt pop through the carberator popped through the pipes so i dunno but its probably fouled plugs trust me happens alot with performance mine foul out once a month mabey to much gas but o well it runs better that way, good luck

Now that I have the lifters adjusted I think it is not backfireing anymore. But when it died it felt like all fuel was cut off. Both times and then acted like it was flooded. But the dist. was moved on me. Im kinda adding to my above post so I hope I don't repeat anything. I have heard on the older holleys that once it backfired through it the power valve blew. I don't know Im just tring to get a few options so I can try some different things if the easy stuff don't work. Just for note the fuel pump is about a month old and before I changed the cam the car started and ran fine. Pulled about 5800rpm with no problem w/ what I beleive is the stock cam. I'll stop rambling but I appreciate all the info.

Thnaks
Shane

I had a problem with Dist hold down,

I took a big A$$ hammer and used the manual method to bang the fingers down a little bit it holds with an Iron Grip now.

your cut off may be lack of Fuel pressure, do you have a high volume fuel pump? , either that or the Fuel Bowles may be set incorrectly and you stomp, it Drinks and cant be replaced fast enough to keep the fire alive.

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Chris's 67 RS can be seen at http://www.geocities.com/macphreak4evr/index.html
JOIN THE CAMARO NET WEBRING! http://nav.webring.yahoo.com/hub?ring=camaronet&list

[This message has been edited by Chris Edwards (edited 10-23-2000).]

Sorry to step on feet here, but the ONLY accurate valve adjustment method is the exhaust opening/intake closing method, done that way, you don't miss valves. You also get each and every cam lobe on its dead center of the heel, making adjustment correct, not inconsistant.

Now, I don't care what anybody else says, we proved this on the Team Chevells site, it works on EVEDRY cam ever made, no matter the type or grind.

Just setting it straight.

I don't mean to step on toes either. But thats the way I adjusted to miss the exhaust valve on #8. Either I'm an idiot are thats not the only way you can't miss one. I don't have a high vol fuel pump. I talked to a local machanic and he said that it sounded like when the sec. are opening it starves for fuel and dies. Any thoughts on this.

Thanks
Shane

I bought one of the Autozone distributor hold downs and I think they bend when you tighten the bolt. No matter how I tightened it, the distributor still turned. I used a stock GM one and it worked fine. Damn China made junk. Sorry.......

Mark

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Mark
1992 Firebird 355/Six Speed
1991 RS 350 / 700-R4
1987 Toyota Pickup 383 / 500 + HP 10.963 @ 119.95 Slicks / 11.997 @ 114.23 Radials
http://personal.lig.bellsouth.net/~racer383/

Hey, get rid of the junk crome dist hold down. Your dist will never get tight unless you modify it. Original steel GM will not flex and will hold it like it should.

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Tim (http://www.geocities.com/sixt7ssrs/CAR2.jpg)
67 ss/rs (http://www.geocities.com/sixt7ssrs2/Mvc-562f.jpg), MODIFIED (http://www.geocities.com/sixt7ssrs/main.html)
Tim's Homepage (http://www.geocities.com/sixt7ssrs)
AOL-IM = sixtsevnss

Please read all my posts. I changed the cam, and intake, and push rods. Put it back together and had this problem. I stated that I didn't have the dist tight enough to hold it. That was because I didn't figure I could guess the right timing without driving the car. I never said anything about having a bad hold down. It never moved before the cam swap and thats because it was tight it is the origanal gm type hold down. My problem is not the dist. turning thats not going to cause a car to lay down and die. (not anymore than its moving). We have gotten way off the point on this post and I am sorry if I gave some bad info.

Thanks
Shane

If you are still having the problem with your distributor moving, have you checked to see if it was interfering with the firewall. I have had that problem with my previous car, also dont have a broken mount do ya?
Just a suggestion, hope it helps.

shane,

how old is the carb? any chance that something is getting stuck in the jets? are you running a fuel filter? what about a tune up? like cap and rotor. are you running a points or HEI? might need to ask Ignitionman if there is something wrong in the distributor. i plan to get in touch with him(if he can e-mail me) to have him build a points to hei conversion formy car.

Good luck, Jesse

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It was a pinched fuel line. Coming right out of the pump I had the rubber line ran behind the bottem rad. hose and it was kinked. rerouted it and man oh man what a difference. Love it!!

Thanks for all the advise,
Shane

Sweems,
The 327 that was in my car when I bought it back had an 1850 Holley on a 300hp AFB stock cast-iron intake with an adapter. It back-fired through the carb.

I was told by the guy that sold me my car back that he figured it was the power valve being ruptured or whatever because he said up to that point the little engine ran like Jack-the Bear. The cam was a little Crane Fireball, 290/218, .454" etc.. otherwise engine was stock with Hookers..

Check it out??? pdq67