|
200 Series General Forum for the Volvo 240 and 260 cars |
Information |
|
'91 240 issuesViews : 1148 Replies : 22Users Viewing This Thread : |
|
Thread Tools | Display Modes |
|
Apr 21st, 2019, 18:41 | #1 |
New Member
Last Online: Aug 7th, 2019 03:21
Join Date: Mar 2019
Location: Houston, TX
|
'91 240 issues
Hello all,
I'm having a problem with my 1991 Volvo 240. During normal driving it seems to not be getting enough fuel at higher speeds. Right now the car does not have a lot of power and will not go faster than 55mph. If I clamp the fuel return line it will easily hit 80mph but then (predictably) is getting to much fuel in the lower speeds and idle. I am at a total loss as I have already cleaned out the fuel lines, changed the fuel filter, changed the fuel pump and changed out the fuel pressure regulator. Any ideas? Graham I forgot to mention, this is a B230F engine with a Bosch fuel injection system, the ECU and in tank pump have both been swapped with known working ones. Last edited by Grahambharper; Apr 21st, 2019 at 20:25. |
Apr 21st, 2019, 21:58 | #2 |
Master Member
Last Online: Yesterday 23:04
Join Date: Nov 2012
Location: London and Cambridge
|
I presume the check engine/lambda light is on? If so, there are codes to be read-
https://www.volvoclub.org.uk/faq/EngineOBDCodes.html Read the above guide and see which fault codes the system has stored, then reply on here. My guess is the lambda sensor, but check the codes before buying parts. Cheers |
Apr 22nd, 2019, 02:00 | #3 |
New Member
Last Online: Aug 7th, 2019 03:21
Join Date: Mar 2019
Location: Houston, TX
|
Thank you for the reply,
The lambda (o2) sensor did go bad and was replaced about a month ago, I'm not getting any codes (or CELs) since replacing it besides the occasional 2-3-1 - Lambda control - too lean or too rich at part load. |
Apr 22nd, 2019, 02:55 | #4 |
Senior Member
Last Online: Oct 9th, 2022 04:41
Join Date: Feb 2011
Location: Currumbin, Queensland
|
Have you checked, cleaned and/or replaced the fuses? It's important -- I believe that the fuel pump is fuse number 6.
__________________
Present: 1990 240GL saloon, 1992 240 estate Past: 1988 240GL; 1971 144DL; 1972 145DL |
Apr 22nd, 2019, 03:51 | #5 |
New Member
Last Online: Aug 7th, 2019 03:21
Join Date: Mar 2019
Location: Houston, TX
|
Yes I have checked the fuses and the relay, both pumps are turning on.
|
Apr 22nd, 2019, 05:39 | #6 |
Senior Member
Last Online: Oct 9th, 2022 04:41
Join Date: Feb 2011
Location: Currumbin, Queensland
|
This is a tough one. It's possible that your new O2 sensor has failed, especially if this never happened before replacing it. Given that you've been swapping in parts, I assume you have easy access to spares. I'd be tempted to switch out the ICU, as you already switched out the ECU.
__________________
Present: 1990 240GL saloon, 1992 240 estate Past: 1988 240GL; 1971 144DL; 1972 145DL |
Apr 22nd, 2019, 22:01 | #7 |
Premier Member
Last Online: Nov 23rd, 2023 14:26
Join Date: Jun 2014
Location: Haltwhistle
|
If you disconnect the MAF does it get even worse or stay the same?
__________________
1993 2.0 Turbo SE with 1991 2.0 Turbo engine. Older is better! |
Apr 23rd, 2019, 15:11 | #8 |
New Member
Last Online: Aug 7th, 2019 03:21
Join Date: Mar 2019
Location: Houston, TX
|
I have tested the 02 sensor again and it seems to be working, as far as the MAF sensor goes when I unplug it the rpm Increases at idle but bogs as soon as any throttle is applied.
|
Apr 23rd, 2019, 20:48 | #9 |
Master Member
Last Online: Yesterday 23:04
Join Date: Nov 2012
Location: London and Cambridge
|
How did you test the o2 sensor?
Next suggestion- partially blocked exhaust pipe from the cat disintegrating inside. Hard to know what to suggest to test this- undo the exhaust after the downpipe and go for a drive? The lack of backpressure might mean it’s down on power anyway. And it’d be really loud of course. Cheers |
Apr 24th, 2019, 21:24 | #10 | |
Premier Member
Last Online: Nov 23rd, 2023 14:26
Join Date: Jun 2014
Location: Haltwhistle
|
Quote:
Another thing to look at, possibly, since we're going through everything ; remove the cam cover and manually turn the engine, check all the valve buckets are depressing and raising correctly.
__________________
1993 2.0 Turbo SE with 1991 2.0 Turbo engine. Older is better! |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|