Car stalls when trying to increase rpm's - Team Camaro Tech
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post #1 of 7 (permalink) Old Aug 19th, 06, 06:17 PM Thread Starter
 
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Car stalls when trying to increase rpm's

I have an 89 camaro with a problem. I've fina;;y got the engine completly together and it starts up fine with a great idle, but as soon as I touch the throttle to increase rpms, it stalls out. The fuel pressure is fine, the timing is right, and I've checked for vaccum leaks and found none. I do notice that there is a very heavy vaccum on the brake section. Any one have any clue of what's causing it.
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post #2 of 7 (permalink) Old Aug 20th, 06, 05:44 AM
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Dave
 
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Re: Car stalls when trying to increase rpm's

No fuel, is my guess. Check the obvious, like fuel filter. Or perhaps you bent (and kinked) a fuel line, while R&R'ing the engine.


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Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 7 (permalink) Old Aug 20th, 06, 10:03 AM Thread Starter
 
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Re: Car stalls when trying to increase rpm's

I would have thought it to be a fuel problem as well, but I checked the fuel pressure and it's fine. There no possibility that a line can get bent or crushed in the process of reving, no lines are in the path of the throttle.
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post #4 of 7 (permalink) Old Aug 21st, 06, 04:13 AM
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Re: Car stalls when trying to increase rpm's

Definately sounds like a fuel problem. Even though the fuel pressure is fine you cannot rule out a fuel problem. Something somewhere is not working properly. I am assuming that it is a fuel injection motor. If it is, check the injectors and make sure they are not clogged. If it is a carbed engine, then I would suggest borrowing a buddies carb, throw it on and see if you have the same problem. If you do, then look elsewhere(vaccuum lines) if you dont, then it is something in the carb. My guess is the carb(if you have one) since what you are describing is a condition that is present when more air and NOT enough fuel is being introduced to the motor....

GOODLUCK

MARK
TOOFUN
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post #5 of 7 (permalink) Old Aug 27th, 06, 08:53 AM
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Dave
 
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Re: Car stalls when trying to increase rpm's

Quote:
Originally Posted by 78z28 View Post
I would have thought it to be a fuel problem as well, but I checked the fuel pressure and it's fine. There no possibility that a line can get bent or crushed in the process of reving, no lines are in the path of the throttle.

By saying "R&R", I meant "Remove and Replace", not revving, heheh.............


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Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #6 of 7 (permalink) Old Aug 28th, 06, 02:08 PM
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Tom
 
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Re: Car stalls when trying to increase rpm's

What kind of Distributor are you running? I ask because I remember years ago I pulled in a station wagon that would start and idle just fine but any gas it would just shut down. Long story short, it turned out to be a wire at the pickup coil in the HEI distributor. At idle the wire would touch (and look normal) but as soon as the throttle would crack open the vacuum advance would turn the breaker plate pulling the wire away from the pickup coil shutting the car down. I had the luxury of a tune up machine so it was very obvious that I was loosing spark. If you are running an HEI, pull the cap and tug on the wires firmly, but not hard enough to rip them out! Just enough so you know they are connected. Every time your vacuum advance turns that breaker plate those wires flex.
-Your problem just reminded me of the one I had -Probably not the same but, you never know!!
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post #7 of 7 (permalink) Old Aug 29th, 06, 07:15 AM
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Re: Car stalls when trying to increase rpm's

Are you getting any error codes (check engine light on)? My guess would be the throttle position sensor is not working properly. I think that may be a MAF car. The MAF can cause this problem, but is likely to set a code. If it is a speed density system, the MAP sensor could cause it as well. Sounds like the ECM is not delivering more fuel when you press the accellerator which is why I suspect the TPS.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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