Volvo 940 cold start problem.
Hi! I am new to this forum and I really need someone's advice. So I have a 1993 Volvo 940 Rex Regina system mixed with Bosch. Anyways, I am having trouble with my car in the mornings. This started about a week ago and this is what happens:
So I turn the car on and all is well. However after 2 minutes of getting warm the car starts to act weird. The idle starts to go up and down, up and down, up and down, and it starts to sound like a cammed muscles car 🤣. It's pretty annoying. It also idles up to 1,000 rpms and sometimes goes up to 1,500 then back down and starts to go up and down up and down. However after getting 1/4 warm it settles down and goes back to normal. Car drives well and doesn't act strange when completely warm. I want to figure out what's going on before it get worse. I have changed: Vacuum lines Pcv lines Fuel pressure regulator Cleaned IAC and even got a buddy to let me test his. I've changed pretty much everything to do with vacuum lines. I even sprayed around with starter fluid to see if there were leaks somewhere. I cleaned my MAF Does anyone have any suggestions?? I literally running out of hope. This car has been in my family since 93 and would like to keep it that way. |
Is it throwing any codes? |
It may be still the MAF sensor--cleaning it rarely helps. It could be the Coolant Temperature Sensor.
Turn the car off when this is going on, unplug the MAF, see if there is any diff. once plugged back in and running. |
Alright sounds good. Thank you. I just had the MAF replaced cause that was my previous issue and boy did it give me a ton of trouble. |
Goldenblock here!!! Its your throttle position sensor... Check to make sure you hear a click upon opening/closing as you manually open throttle. It may need adjusting or replacing!! Oss
I also have regina bosch hybrid 1989 740 gl |
Clean the throttle body?
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It does click. I had a buddy of mine readjust the throttle body but no help.
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Originally Posted by tylswil
(Post 469549)
Is it throwing any codes? |
the 'TPS' is just a microswitch, closed if the throttle is fully at idle, it enables the idle control circuit. some cars also have a microswitch for full throttle, this is less important
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