Volvo Owners Club Forum - View Single Post

rippedoffagain · Sep 2nd, 2009, 10:54

Hi all

Some of you may have seen my other threads about my engine troubles, but as I didn't choose very descriptive titles I thought I'd try again.

On my 940 estate, 2.3 normally aspirated, I get the following aggro:

* Lambda light comes on from time to time
* random lumpiness at idle (ok most of the time then the whole car will shiver briefly)
* Smell of petrol when first starting up, which I think is coming from the exhaust end
* Starts every time, but needs to be turned over a bit more than it used to.
* Random rough running and reduction in power

From what I've read, both in replies on other threads, and on the FAQs, it seems fairly likely to be the fuel pressure regulator that's at fault.

Could it be anything else?

Someone said that sometimes when they fail, petrol leaks down the vacuum hose straight into the inlet manifold after the throttle. Is this the only way they can fail or can they pull other tricks too? If so how would I diagnose it for certain without proper gear?

Are they a nice easy job to change?

If petrol has been leaking down the vacuum hose, that would cause the engine to run rich I believe. Would that mean the cat and lambda sensor will be done for?

Sep 2nd, 2009, 10:54	#1
rippedoffagain Premier Member Last Online: Nov 16th, 2019 18:20 Join Date: Mar 2009 Location: Yorkshire	Faulty Fuel Pressure Regulator? Hi all Some of you may have seen my other threads about my engine troubles, but as I didn't choose very descriptive titles I thought I'd try again. On my 940 estate, 2.3 normally aspirated, I get the following aggro: * Lambda light comes on from time to time * random lumpiness at idle (ok most of the time then the whole car will shiver briefly) * Smell of petrol when first starting up, which I think is coming from the exhaust end * Starts every time, but needs to be turned over a bit more than it used to. * Random rough running and reduction in power From what I've read, both in replies on other threads, and on the FAQs, it seems fairly likely to be the fuel pressure regulator that's at fault. Could it be anything else? Someone said that sometimes when they fail, petrol leaks down the vacuum hose straight into the inlet manifold after the throttle. Is this the only way they can fail or can they pull other tricks too? If so how would I diagnose it for certain without proper gear? Are they a nice easy job to change? If petrol has been leaking down the vacuum hose, that would cause the engine to run rich I believe. Would that mean the cat and lambda sensor will be done for?