I recently bought a 1990 Lumuna with only 48000 miles on it. I bought the car from an old lady who did not drive it much, just to the store every now and then. She told me that the car had sat in her garage for a year and is running a little rough. I thought know big deal must be somthing from sitting for so long it cant be to searios if it only has 48000 miles on it. So i took it home an did a tune up new pluges and wires, changed the oil and put fresh gas in it. It ran great for a couple of days then my speedometer quit working when this happened my cruze control and ac quit working it stalled all the time and it wont idle. Every know and then my speedometer starts working again and so does everything else it runs like a top when the speedometer is working. I changed the speed sencor but this was know help. I am pulling my hair out trying to figure this out. any help will be great.
The seals inside the engine block could have damage to them causing you to loose compression and your car to stall. The best option you could do is to take it to a mechanic and have them look at it.
but the seals magically get better when the speedometer works?
does the car idle if you put it in park, and if you have a rpm gauge does that act up as well.
I do not have an rpm guage and it does stall in park, also my ac does not work when evering else is acting up dont know what that has to do with any thing but that is what is happening. When my speedometer and whole car started acting up i turned on my ac and everything stayed working for know. I do not dare turn my ac back off i am afraid it will act up again.
well this is interesting looking at a wiring diagram your a/c,cruise control,idle air control valve are controlled by the engine computer so you have wiring problems or a failing ecm
Well i was wrong about the the car running fine with the ac on it was just a quinsadence, but the ac will not work at all when the car is acting up so i think i will have to agree with you about it being the computer. I will replace the computer and then let you know how i make out, this is after i replace the magical seals in my block (lol).
Anytime I have a car come in the shop with a driveability issue and it has low compression, I immediately install a new speedometer. Presto, they run like new. Much easier than a re-ring also. :thumbs:
So you are saying that if I rering my car my speedometer will work?
Well, based on someone else's logic, that may also work. Good thinking. I've also heard that a new starter will make the stereo sound better. Strange but true.
thats awesome im going out to get a new starter right freakin now, ya baby hear that bass wink wink it's the new starter
before replacing the computer i would probably take a further look at things. they are expensive. perhaps the ac doesn't work because the engine is idling too low?
no codes? ur car runs on a speed sensor>ecm>speedometer..
ur cruise will not work if something is wrong with the speed circuit.
ur a/c will not turn on if ur ecm doesnt want it to... IE.. if engine is running rough or high load at idle, the ecm will not activate the a/c clutch.
from looking at the outdated wiring diagrams, it seems ur sensor produces ac voltage.
well this is interesting looking at a wiring diagram your a/c,cruise
control,idle air control valve are controlled by the engine computer so you
have wiring problems or a failing ecm
i didn't say to replace the ecm i meant for you to have to unit checked like the wire's to the ecm, the ecm plug itself ,grounds, when the car acts up try checking for code's see if the computer will communicate while the car is acting up maybe the computer is failing i don't know for sure it could be loose wire's
Well I replaced the ECM anyways and this cured my problem. I picked one up at a salvage yard for $40. They told me if it did not work they would refund my money so i figured what would i have to lose. The car drives like a totaly diferent car runs smoother all my electronics work and it even seems to get better gas mileage. I thank everybody for there help on car forums.
glad we could help :thumbs:
He mentioned his car was stalling out. I was trying to help him. Instead of trying to make yourself look big and bad, help him out. I added my two cents I was trying to help. Boy your Internet Gonads must be really really big :screwy: :thumbs:
actually, you were leading him in the wrong direction, we were just
straightening that out before he went out and bought a new engine.
Now would the speedometer have anything to do with the stalling of the car?
The AC relay, the criuse control relay and vehicle speed sensors (along with a bunch of others) are inputs to the ECM
Output from the ECM include vehicle speed @ the speedometer (on many cars), IAC, ignition timing, and fuel metering/control