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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by pinguin on Sat Jan 16 10:11 CST 2010
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last visit: Tue Feb 1 10:26 CST 2011

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My 93 945 with the rex/regina fuel/spark system doesn't run properly.

when started, it will idle ok for a while, eventually, it will start to stumble a bit, and then it will just die.
If you try to give it throttle, it will bog, unless you feather the throttle, then you can get some revs out of it.

When driving, it chugs on throttle, runs poorly, and sometimes stalls under decel.

Either way, it seems to run fine until it warms up a little, or you try to give it gas.

So far I've figured out it's not a Fuel Pump, FPR, Clogged catalytic converter or MAP sensor...

Any Ideas folks?
--
Why are you doing that to a Volvo? Because I can.

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by carlosh-r on Tue Jan 19 10:17 CST 2010
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last visit: Fri Oct 1 08:00 CST 2010

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If the engine dies went it gets hot and it does not start again until it cools. The problem is the RPM sensor.

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by pinguin on Tue Jan 19 17:20 CST 2010
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last visit: Tue Feb 1 10:26 CST 2011

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It's not that, it'll start right up again after it dies.
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Why are you doing that to a Volvo? Because I can.

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by runwld2 on Tue Jan 19 11:55 CST 2010
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last visit: Tue Sep 30 13:11 CST 2014

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Maybe, but you can check for a faulty sensor with the OBD unit,
see the FAQ
http://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm#EZK116IgnitionFaultCodes

--
84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 93 945 Turbo AW71, 91 245SE AW70 IPD bars, 93 245 CLassic M47

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by carlosh-r on Tue Jan 19 13:29 CST 2010
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last visit: Fri Oct 1 08:00 CST 2010

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I don't know the 945 very well. I think the OBD started in 1996. The 93 regina may have a code reader near the strut on driver side. I had the RPM problem. The car was acting very similar. I did not get a code or engine light ON. Though as soon as I replaced the RPM sensor the problem was gone.

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by Philip on Mon Jan 18 06:46 CST 2010
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last visit: Thu Oct 23 10:21 CST 2014

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I had similar issues. I thought it was not the fuel pump, but the pressure was borderline. When I went to test the fuel volume, there was not enough pressure to the return line, so this led me to the problem.

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by RobCooper on Sun Jan 17 04:30 CST 2010
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last visit: Tue May 13 17:31 CST 2014

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check the faq section for poor running links in the faq welcome page

mine kinda did the same stuff. I had a bad knock and coolant temp sensor connection.

also the cold start connector connx under the manifold was really full of dirt

also think about the fuel pump relay

check all vacuum lines

rob

let us know

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by HillBilly on Sun Jan 17 02:58 CST 2010
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last visit: Thu Oct 16 08:26 CST 2014

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Although you say that you've figured out it's not a fuel pump issue, it sure sounds like a fuel PRESSURE issue to me.

Check the fuel pressure and post back.

steve

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93 regina 945 bogs with throttle, and stalls at idle 900 1993

posted by BigMile940T on Mon Jan 18 16:42 CST 2010
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last visit: Thu Aug 5 20:51 CST 2010

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I tend to agree with it sounding like a fuel delivery issue. Both my 740 & 940 ran as you described until replacing the fuel pump. Interesting story about fuel pump replacement on my 740:

My 740 had 300,000 plus on it and died on afternoon. Next day it started up like nothing was wrong, so I promptly put it in drive and started driving home. About 10 miles into my "journey" it died again. After towing it and replacing the fuel pump it would start & idle but not run well enough to drive. I chased every possible part I could to find out that the store sold me the low pressure pump for a 2 pump system. Once the correct single high pressure pump was installed, it ran very well.

Good luck with you brick!

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