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740 1990 starts and shuts down

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
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Stetson
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740 1990 starts and shuts down

Post by Stetson » Tue Jun 04, 2019 9:11 am

Hi,
I just got my hands on a mint condition 740. It's got B230F LH2.4 and I can't figure out what's bugging it. It starts up fine but won't stay running. Just bogs down immediately when the revs come down to idle.

Here's a small video of me trying to start it: https://www.dropbox.com/s/8p7qo8nrnz5qx ... 6.mp4?dl=0

I checked for any fault codes and there aren't any. I've already changed the MAF and the TPS. Didn't change it's behavior.

Any suggestions on what to try next? I'd really like to get this old lady back on the road since it's in such a good shape and with very low mileage.

E: When the MAF is unplugged I can keep it running if I pump the throttle and keep the revs up. After the engine gets warm it idles but very roughly.



93Regina
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Re: 740 1990 starts and shuts down

Post by 93Regina » Mon Jun 10, 2019 7:02 pm

Pull plug off CTS (Coolant Temperature Sensor)....if outside air temperature is around 60°F (15 C), it should start fine.

Do a fuel pressure test on fuel rail...there is a port for it....



dm635
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Re: 740 1990 starts and shuts down

Post by dm635 » Sun Jun 16, 2019 5:34 am

I had a problem on my '91 740 where it would start just fine, but nearly die after that making it undrivable. I replaced/swapped all the electrical spare parts I have. It ended up being the FPR. Fuel pressure regulator.
Not saying this is your problem, just my own experience on my 740.


96-964
91'745

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Stetson
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Re: 740 1990 starts and shuts down

Post by Stetson » Wed Jun 19, 2019 8:19 am

I just changed the FPR. Didn't help.

I also tried unplugging the coolant temperature sensor. I can get it running just as I could when unplugging the MAF. Although the outside temperature is about 24c and not around 15.



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matthew1
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Re: 740 1990 starts and shuts down

Post by matthew1 » Wed Jun 19, 2019 8:25 am

Could be fuel delivery, plugged cat. converter, air filter, air intake generally, bad spark plugs. I don’t know a lot about red blocks, but given what you’ve tried, I’d look at those next.


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93Regina
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Re: 740 1990 starts and shuts down

Post by 93Regina » Wed Jun 19, 2019 2:54 pm

Stetson wrote:
Wed Jun 19, 2019 8:19 am
I also tried
Once moving, does engine run fine?



Stetson
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Re: 740 1990 starts and shuts down

Post by Stetson » Wed Jun 19, 2019 3:05 pm

No it does not run fine. It barely stays idling with the coolant temperature sensor or MAF unplugged and if I touch the gas pedal it stalls immediately.



93Regina
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Re: 740 1990 starts and shuts down

Post by 93Regina » Wed Jun 19, 2019 8:09 pm

Stetson wrote:
Wed Jun 19, 2019 3:05 pm
No it does not run fine.
Back to the basics....Timing belt Check...see this post



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