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been a diesel mechanic for 55 years and thought I know it all. your response is logical, thought about it but vacuum test indicates a consistent reading, no fluctuation whatsoever 12lbs at low idle to 25 when returning to low idle. however you could still be right inspite of vac gauge reading. unless you could come up with another possible answer. I will replace the gskt and get back to you, hoping you are right and me wrong. I am still in learning process with cars. thanks for your time
. This is sort of a project vehicle on weekends. I have not done what you suggested and proved you are right, I will refrain from giving grades or bonuses. It appears that you are right, but I need hard evidence. I will get back with the results by week-end. July 21. Thanks for your time and patience. By the way, my name is Bill.
Before I asked for help in the net, I shot ether (starting fluid) around the intake manifold and it didn't cough, I assumed it was alright along with the vacuum test. But to be absolutely sure. I will change the gskt because it could be an internal leak. At times I hear gurgling sound inside the air cleaner box when surging up and down, mostly while dropping rpm. My hot rod speed racer son stated that he heard a real loud whistling sound just before it started, full throttle no doubt. But whistling sound appears like gskt. giving out. I will start from there and keep you informed. I have other things to do, so I will appreciate your patience Pete. This will be solved, time is not critical here, thanks.
I did replaced intake manifold gasket, but the result is the same, I will do a smoke check next, soon as I can device a tool to do it, without taking to a shop who has it, and having to pay mega $$$ per hour. Any suggestion? Like put a gofer bomb into a container, pressurized it and hook it up into the vacuum port?
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no it does not fluctuates and stalls out eventually
unplugging the vacuum air control valve center top of throttle body goes into normal idle, misses on acceleration and stalls out, you are correct. Next?
Sorry Pete, its a 1991 Acura Integra, 1.8 engine with 5 speed std. trans mission. Thanks for asking, now I hope you have better idea what we are dealing with here. A lot of changes happened after these model for a good reason
I did unscrew it one complete turn to see if that was the problem it did not affect it in any way. So I screwed it back, same result
this vehicle had overheating problems. Water pump belt head gskt and radiator was replaced. Then wont pass smog sent it to shop they retimed the engine and passed the smog. Engine operating normally till two months later this just comes up instantly when my son was driving it. I do have another computer here if you feel that's a possibility, used one from another vehicle similar to it.
not the same part# I don't think, this one could be from a car with automatic trans (not sure). I will get back to you later I need to go work thanks Bill
alright, just changed the computer still the same, I took the distributor out, it was leaking oil slightly. I will change the distributor by weeks end and readjust the valves. If its still the same I will take it to a diagnostic shop for evaluation. There could be some wires loose or crossed because I had a stereo system installed recently and they even fried my alternator . check engine light stayed on after that and one of the guy who is going to school for diagnostic checked it and he said one of the speaker wire was connected to the computer.
I will get back to you on Friday, p.m. thanks Pete. But let me know if there is something else simple that can cause it .
Junked the car, that solved my problem. However I have another question.
where is the location for idle fuel air mixture on the carburetor of a 1981 Datsun model 510.z20 engine with endless smog hoses attached to it?.
thanks for your effort, I found it below towards the front of throttle cable well hidden by a maze of vacuum hoses
Pete I was junking the Acura Integra but I am not a quitter so tried one more shot. One simple item right under my face, that I kept going around and over it. Replaced the thermo valve under the throttle body that was stuck open and that cleared everything. It runs great. Thanks for your help and nice knowing you.