Still need some help after cam install...
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Launching!
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From: North Little Rock, Arkansas
Still need some help after cam install... I installed a new cam over the fourth of July weekend. The car is running great except for on occasional problem starting. I will turn the motor over and it doesn't start. Turn it again and it will hit just fine. Then every once in a while on the first try it will not start and as the motor is stopping it's rotation I here a small hiss of air gurgle out the back or a small back-fire. Other than this issue, it runs it's *** off.
Question:
When we did the cam install and we were pumping the lifters up in place they all responded immediately except for one. We held this one up with a pin magnet. Could I have a lifter problem? The valve train is as quiet as stock. I mean no noise at all. The guy that helped me install the cam who has installed many was even surprised how quiet the valve train is. Anyway, this one lifter we had to hold up is bugging me. Could this be the problem? Maybe the valve is not seating all the way and air is getting in the engine when it's not supposed to. I have no more ideas and I need some help.
Thanks!
Question:
When we did the cam install and we were pumping the lifters up in place they all responded immediately except for one. We held this one up with a pin magnet. Could I have a lifter problem? The valve train is as quiet as stock. I mean no noise at all. The guy that helped me install the cam who has installed many was even surprised how quiet the valve train is. Anyway, this one lifter we had to hold up is bugging me. Could this be the problem? Maybe the valve is not seating all the way and air is getting in the engine when it's not supposed to. I have no more ideas and I need some help.
Thanks!
Launching!
Joined: Apr 2005
Posts: 205
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From: Atlanta area, GA
The lifter tray not holding up a lifter should have nothing to do with your issues..
Installing a new cam w/o a tune might though.. The other thing that might be an issue is the cam position sensor..
Installing a new cam w/o a tune might though.. The other thing that might be an issue is the cam position sensor..
I'm not an expert but if you had a lifter collapsing on you it would be very obvious ie; loud ticking & you would have a miss. I don't know what could be happening but I would double check all connections etc.
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Launching!
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From: North Little Rock, Arkansas
Ok great thanks guys. I will rule out the lifter being the issue. The tune I will have done this week the hold up has been the dyno or lack there of at my local performace shop. I have had them do a "basic" tune which was raise the rev limiter and turn off SES light and so forth. I didn't think wideband tuning would have anything to do with how the car starts, rather a/f tuning on the top end. Am I wrong?
Tell me more please about this position sensor. Where is it? How do I check it?
Tell me more please about this position sensor. Where is it? How do I check it?
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From: The South
Originally Posted by SSCoulter
I didn't think wideband tuning would have anything to do with how the car starts, rather a/f tuning on the top end. Am I wrong?
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Launching!
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From: North Little Rock, Arkansas
Originally Posted by PREDATOR-Z
Why do you seem so astonished since you don't have a tune????
Tune it.
Tune it.
Last edited by SSCoulter; Jul 26, 2005 at 08:49 PM.
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Launching!
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From: North Little Rock, Arkansas
Originally Posted by blkZ28spt
The tune will absolutely help the way it drives. A typical basic tune can't do anything but raise the idle speed, which helps but doens't do a whole lot. A proper, hands on dyno tune will make it run 100 times better. I don't know the specs on your cam, but the larger it is the more it needs tuning in order to run properly.
The cam specs are 226/226 .591 on a 112LSA.
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From: The South
Take this for what it's worth, but i wouldn't worry about the small backfire. Not only is your car likely running rich, but after an attempted start there will be fuel in the exhaust that did not burn. The small backfire is probably just that fuel being burned. No guarntees that it's not something else though, I'm no expert.
If nothing else I would avoid driving it until it is tuned and/or you get a specific answer about the backfiring.
If nothing else I would avoid driving it until it is tuned and/or you get a specific answer about the backfiring.
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Launching!
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From: North Little Rock, Arkansas
Originally Posted by blkZ28spt
Take this for what it's worth, but i wouldn't worry about the small backfire. Not only is your car likely running rich, but after an attempted start there will be fuel in the exhaust that did not burn. The small backfire is probably just that fuel being burned. No guarntees that it's not something else though, I'm no expert.
If nothing else I would avoid driving it until it is tuned and/or you get a specific answer about the backfiring.
If nothing else I would avoid driving it until it is tuned and/or you get a specific answer about the backfiring.