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Old 10-01-2017, 11:52 AM   #1
jos 240
Join Date: Oct 2017
Location: Limburg (Netherlands)
Default B230FT idle saga...

Dear forum members,

As a Volvo enthousiast I have been driving RWD Volvo's for many years now.

2,5 years ago I bought a 240 1993 station wagon with a B230FT engine. I have been able to do the most of the repairs and maintenance myself, but now I am stuck.

6 months ago I started the search to solve the high idling. Since the problem is intermittent it is quite difficult to to pinpoint the cause. ( Idle goes up to 1600 - 1800 rpm than drops to 1200 and goes up to 1500 again and so on)

What I did so far (in random order):

1. Cleaned the throttle body, multiple times
2. Replaced the throttle body ( because there was some play on the butterfly) with a second hand one & checked the settings etc.
3. Replaced the TPS and set it to click at the right moment.
4. Cleaned all the contacts of all sensors/idle motor etc.
5. Replaced the FPR with a brand new one
6. Tried two different AFM's with no result
7. No fault codes during this half year
8. Replaced the ECU cooling sensor
9. Replaced the IAC with a new one
10. Checked for air leaks several times ( also checked by my local garage and Volvo specialist specializing in the 240 model), but found no leaks.
11. Cleaned the IAC
12. The TPS clicks at the right moment and throttle body is closed etc.

Bosch LH 2.4.

I have found a lot of advice / tips when searching this great forum, but I just cannot fix this problem

To be honest you are my last hope to fix this problem.

Jos ( Netherlands - Limburg)
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Old 10-01-2017, 02:14 PM   #2
Board Member
petiww's Avatar
Join Date: Aug 2011
Location: Hungary

Quick thoughts:
Do you have a charcoal canister? Plugging the ports?

Have you tried plugging the vacuum booster port?

Do you have proper speedo signal from the cluster?

Have you tried swapping ecus?
1980 Brown 244 GL
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Old 10-01-2017, 08:38 PM   #3
The Librarian
hiperfauto's Avatar
Join Date: Nov 2011
Location: So Cal

Have you tried using control function 2 of the OBD to test the TPS and wiring?

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Old 10-01-2017, 08:59 PM   #4
Vincent Gagnon
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Vincent Gagnon's Avatar
Join Date: Sep 2015
Location: Golden, BC

Originally Posted by jos 240 View Post
3. Replaced the TPS and set it to click at the right moment.
I had the exact same problem after ****ing around with the TPS. I also did the: "click at the right moment" thing.

Just for fun, get the screws loose on the TPS without removing them (just so you can move the TPS).

Start the car.

Try to move it to see if it influence the idle.

Good luck.

Member of TBCCS

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Old 10-05-2017, 07:13 AM   #5
jos 240
Join Date: Oct 2017
Location: Limburg (Netherlands)

Thank you for the suggestions & help!


1.I will plug the ports ( on the bottom of the cannister you mean?). Can I do that also when idle is ok and can I drive the car safely than? Because it is intermittant this problem sometimes occurs once a week / 3 times a day etc.
2. I will plug the vacuum booster port as well.
3. How can I test that the signal from the speedo is ok? I do not know where the the wires are for this signal.
4. Did not swap the ECU yet

I will try that one for sure.

I will try this.
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Old 10-05-2017, 09:47 AM   #6
Board Member
Join Date: Oct 2011
Location: summerville, south carolina

I have an identical issue. It has changed slightly over the last couple years between all the work I've done but nothing has solved the issue.

check my feedback here
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