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Old 02-23-2012, 04:43 PM   #1 (permalink)
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Angry Having issues with power after car warms up!

I last posted about my car dieseling after shutting it off and that has commenced finally, now im having some other issues. The car will start up great, and drive great, but after about 5to 10 mins of driving it starts losing power! So bad to the point where i can put my foot to the floor and it just putters and barley if not at all picks up speed. I usually get about 250 MPT and sence this problem has been accuring I got 75 miles outta a half tank, so its burn fuel somewhere. Ive had my mechanic tell me that it could be my distributor and/or wires that need to be replace and possible settiment build up in my tank thats clogging my carb(which doesnt explain the amount of gas being used), another buddy told me it could be my fuel pressure reg., and someone else who told me it might be my thermo switch thats causing a vacuum leak. All seem understandable but none of those fixs really explain the amount of gas its burning... Any ideas would be very much appricated.

Thanks Brian

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Old 02-24-2012, 01:45 AM   #2 (permalink)
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What year?

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1978 Caprice Classic Landau
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Old 02-24-2012, 05:41 AM   #3 (permalink)
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Did you seafoam.the motor to cure the dieseling? And all of your possible problems above could cause dieseling, so the issue is not resolved, just alleviated. The dieseling will probably return if you don't get to the root of the problem. Your poor economy correlates with the seafoaming, in that if you have had the problem for a while, you probably had excessive carbon build up on the cylinders due to the fuel not being completely burned, and the seafoam got rid of some of that carbon. I am still leaning toward timing. You need to get the timing checked out, and inspect the distributor cap and rotor to see if there is any indication of arcing. Also, with the issue being when the car is warm, it is probably not the whole cause, if the cause of the problem at all, but it could also be a plugged catalytic converter. But that is about the last thing I would check. And yes, check your fuel pressure. I know autozone rents fuel pressure testers. Someone else will have to continue from here, because I know how to see if the fuel pressure regulator is working on a fuel injected car, because the pump primes, and you don't start the car, just leave it in the on position and see if the pressure bleeds off. But on a carbureted car, I haven't done it before. If it is an electrical fuel pump, I would think the procedure would be the same, but for a mechanical fuel pump, I am clueless.

One other thing. Check the ignition coil and the ignition control module. Autozone also tests these. When I test an ignition controls module, I actually cycle it on our tester 12-15 times, because that heats them up like they would be when running in a car. I have seen them pass when cool, but start failing as they get warmer and warmer. Which could also explain your problem, runs fine when cool, like crap when hot. Weak spark=incomplete fuel burn and poor economy.

I am not telling you the definitive problem and solution, just trying to help you troubleshoot the problem. But DON'T start throwing parts at the car without having them tested. Many of the ignition and fuel.components can be tested, and ruled out or confirmed as the problem.

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Old 02-24-2012, 04:55 PM   #4 (permalink)
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Its an 87. I have checked the timing.. its at 8 degress which is prtty much perfect. Have done a fuel pressur test yet but I did replace most of the vaccum lines and components to see if that helps cause its cheap. I don't have a dripped for the seafoam so I have to track one down but I did purchase seda foam

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Old 02-25-2012, 08:42 PM   #5 (permalink)
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It sounds like maybe the choke isn't opening, when its warm enough to act up, pull the aircleaner lid and see if the choke plate is opened or not.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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