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Old 08-02-2020, 01:33 AM   #1
TheMenaceSD
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Default Rough / Sputtering Idle

I replaced the Idle control valve and it started up and didn't die right away. It would try and catch its self and try to keep running. If I held the throttle down slightly it would hold and then some smoke would come out of the exhaust manifold. If I held it down for a couple of minutes it would idle. During this time there is a high pitched sound that seems to be coming from the power steering area, when I press on the throttle the sounds get higher. I have found a hole in the rear muffler but not sure if that is the total culprit. Any help on the possible issue and a solution is greatly appreciated. I am not a mechanic but can figure it out if given some guidance.
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Old 08-02-2020, 02:05 AM   #2
iamrolling
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Which car? Does it have a MAF? Disconnect it and see if the car stays running. That sounds like what happened to me when my MAF spontaneously failed. Your high pitched sound might either be a belt or a vacuum hose. Check both for cracks.
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Old 08-03-2020, 09:45 AM   #3
TheMenaceSD
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The car is a 1990 240 DL Wagon. I will check MAF and it might need a good cleaning. I believe the sound is when the power steering pump is spinning. When it spins faster the sound gets louder. I have a new pump on the way to see if that will fix it.
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Old 08-03-2020, 10:20 AM   #4
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Have you checked for fault codes?

see: http://www.volvohowto.com/how-to-rea...993-volvo-240/

If any trouble codes are found that is what you should focus on first.
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Old 08-03-2020, 01:59 PM   #5
ZVOLV
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Disconnect the vac hose at the fuel pressure regulator and check for liquid fuel.


Spray around the intake with brake cleaner and see if the idle changes= air leak.
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Old 08-03-2020, 02:04 PM   #6
TheMenaceSD
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I have checked the codes. The system does not show any codes, and the check engine light is off on the dash. I have pulled the fule pressure regulator and no fuel leaks out, you can feel a vacuum in the line. I will check for a air leak as well as check and clean the MAF to see if anything changes.
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Old 08-17-2020, 11:39 AM   #7
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Here is an update so far. I disconnected the MAF sensor and the car starts and idles fine. I have tried to spray MAF cleaner but it did not change anything. I have a new sensor on the way which should solve that issue. Now the next issues to resolve are the light smoke coming from the exhaust side and tail pipe and the high pitch squeal sound from the power steering.
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Old 08-17-2020, 12:28 PM   #8
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I went through something similar. Check your intake hose from the MAF to the throttle body very carefully for holes. Also check all the vacuum lines for splits/cracks as well.

Also, 1990 LH 2.4 cars like yours also had an ECU (pink label) that was prone to failure that could be contributing to weird drive-ability issues.
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Last edited by billkaz; 08-17-2020 at 05:27 PM..
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Old 08-23-2020, 11:15 AM   #9
TheMenaceSD
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Quote:
Originally Posted by billkaz View Post
I went through something similar. Check your intake hose from the MAF to the throttle body very carefully for holes. Also check all the vacuum lines for splits/cracks as well.

Also, 1990 LH 2.4 cars like yours also had an ECU (pink label) that was prone to failure that could be contributing to weird drive-ability issues.
Thank you for the suggestions, the intake hose is new as the previous one was melted and also all the vacuum lines. I am not sure which ECU I have but will take a photo today and see if that is the issue. I received a new MAF and when I installed it the same issues came back. My guess is that the MAF is good and it might be the ECU or something else.
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Old 08-23-2020, 07:31 PM   #10
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Quote:
Originally Posted by billkaz View Post
ECU (pink label) that was prone to failure that could be contributing to weird drive-ability issues.
I've heard something like this before, but what fails in these pink label Jet boxes? Is it off the shelf parts, or proprietary chips?
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