Volvo 940 cold start problem.
#1
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.
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.
#3
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#8
It throws a 233 code and 223 sometimes. I wondering if it is the IAC but that is rare. I adjust throttle body and even cracked open the TPS. I found one of the metal things that makes the tps click bent a little for some odd reason but I bent it back. I reassembled it back together however, it did not make a difference. Next thing I did with my volvo friend that is a mechanic is, we decided to try to put the hoses on the IAC all backwards and it seems to have fixed the "cammed" idling however, it started making the alternator make sounds, very odd. I honestly dont know what is happening with this car. Another thing that is happening now is the throttle seems to be sticking at 1,500 rpms when driving. if you are around 40 mph the rpms goes down but then goes back up to 1,500 and stays there. Essentially, feels like the car is driving itself. So now I have issues with idling and rpms getting stuck at 1,500 rpms. If you have the car all warmed up also and rev it passed 2,000 rpms the car will get stuck at 2,000 as well. Any clue? Guessing it could be TPS? Should I replace idle air control and temp sensor?
#9
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