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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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Old May 15th, 2018, 20:37   #1
Gareth2510
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Hello my 940 has a problem its a 1997 2.3 lpt. If i start it it dies give it some gas it will stay alive take my foot off the gas and the rpm drops to the point of stalling & engine light comes on. If it doesnt stall it will hover around 450-500 rpm. I have tried fitting a new coil, crank sensor, and ignition module still has the same problem. I have tried a different fpr rpm increases if i pull the hose. Has a new distributor & arm new fuel pump etc. I have cleaned the eart leads on the manifold resoldered points in radio suppression relay & fuel pump relay ( clicks when priming ) rsr clicks after a few mins of ignition being cut. Now one thing i do notice is the longer of the two injection resistors gets red hot cant even touch it hot. Any ideas as to what the problem could be would be a great help.
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Old May 15th, 2018, 21:14   #2
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From your description, it sounds suspiciously like the MAF or dodgy fuel. Could also be a vacuum hose off somewhere, a split in the hose between the MAF and the main air intake to the throttle body - in fact one of several possible causes.

However, you've given yourself a huge headache already by throwing parts at it. Sometimes even new parts can be faulty and cause similar symptoms.

As we have to start somewhere, what are the plugs like, what is their gap and when were they last changed? What about the HT leads?

Was it running ok before this happened and did it do anything strange befre it happened? Did it just die or was it that you came out one day and it wouldn't start?
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Old May 15th, 2018, 21:29   #3
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just keep throwing parts at it. Eventually you will have changed everything and the problem will be solved.

Have you thought of changing the transmission fluid? I had one once.
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Old May 15th, 2018, 21:32   #4
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On a more serious note, the engine is running. You've replaced everything that, if they fail, cause the engine to stop running.

Here are your clues - the fuel pressure regulator disconnect INCREASED engine speed, and the injector ballast resistors are unusually hot.

Try disconnecting the injectors one by one while the engine is running. Tell me what happens.
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Old May 15th, 2018, 22:24   #5
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Its always taken a few to many cranks before it fires up for my liking. But just started to die once fired up just the othe day. So i checked the coil & the spark looked very weak ordered a new one not the issue. Plugs were changed less than 1k miles ago gaps are good. Dizzy cap & arm done not long ago as was pump & filter. Looking on forums for simular symptoms pointing to pump relay, radio suppression relay, ignition module. However none of these sorted the issue. I dont see it as throwing parts at it as once changed if its not the problem il swap them back over & put the new part in a box no doubt them parts will go at some point & il have a spare already.
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Old May 15th, 2018, 22:32   #6
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The resistor thats getting hot is for the lights dip ive been told.
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Old May 15th, 2018, 22:49   #7
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Quote:
Originally Posted by Gareth2510 View Post
Plugs were changed less than 1k miles ago gaps are good.
But what are the gaps? How big?

I thought it was probably the dim-dip resistor getting hot, usually only one injector resistor or the same number of cylinders, in your case, four.
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Old May 15th, 2018, 23:05   #8
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Couldnt tell you off hand but it wouldnt hurt to check them anyway. i did at time of install though & car was running fine up until this issue popped up.
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Old May 15th, 2018, 23:09   #9
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What did you set them to?
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Old May 15th, 2018, 23:24   #10
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They were gapped at factory i only double checked them before installing them just cant remember what it was.
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