Ignition problems with a Volvo 940

[volvo always]

On a 1996 940 lpt. Where is the CPS located?

thanks. james

[Laird Scooby]

Originally Posted by volvo always

On a 1996 940 lpt. Where is the CPS located?

thanks. james

Same place as the other red-blocks James!

Joking aside as i've not done one, I can't be sure or give you precise directions but it's behind the cylinder head on the top of the bellhousing, secured by one 10mm hex-headed bolt - don't drop the bolt into the bellhousing!!!!!

As far as i can work out, you need the height, reach and strength of Guy the Gorilla with the manual dexterity and hands the size of a small childs.

Enjoy!

[volvo always]

Originally Posted by Laird Scooby

Same place as the other red-blocks James!

Joking aside as i've not done one, I can't be sure or give you precise directions but it's behind the cylinder head on the top of the bellhousing, secured by one 10mm hex-headed bolt - don't drop the bolt into the bellhousing!!!!!

As far as i can work out, you need the height, reach and strength of Guy the Gorilla with the manual dexterity and hands the size of a small childs.

Enjoy!

LOL Any difference on an automatic? May change it as preventative maintenance if it has one!

James

[Dirty Rooster]

Originally Posted by Laird Scooby

...
As far as i can work out, you need the height, reach and strength of Guy the Gorilla with the manual dexterity and hands the size of a small childs.

Enjoy!

I got good, could swap one out/in in a jiffy

[aardvarkash10]

Originally Posted by volvo always

LOL Any difference on an automatic? May change it as preventative maintenance if it has one!

James

Top of the bell housing under the distributor. You can't see it - easiest to trace the cable down to it. REmove it by lying over the top of the engine, 10mm reversible rachet ring spanner in left hand. Locate the bolt and remove it. Withdraw the old unit by drawing it straight up.

Fit new unit in a reverse process (but with spanner still in your left hand!)

Do not over tighten, and do not force the CPS into its location - if its correctly aligned it just slides in (atasttb).

[TonyS9]

Originally Posted by monkeh

If the rev counter just drops like a stone when it dies, It'll be the CPS.
Fried wiring due to its location.
Other options are a bad solder joint on the fuel pump but that will cause the rev counter to show revs when the car dies.
The few Volvo redblocks I have owned over the years have had CPS and fuel pump relay issues but never ignition amps. Made a point of pinching a few when I was at a scrappie, Never needed them. They were just expensive paperweights.

If the fuel is still running its an indication thats its not the CPS. The fuel safety cut off is driven by a low voltage 5V signal (derived from the CPS) between the ignition and fuel computers. If the fuel is still going (indicated by the exploding cat) then its just the ignition, post amplifier thats not working. (rev counter is driven post amplifier, back emf from the coil primary).

I'd bet on ignition amp or perhaps disti or some odd wiring problem.

I often think that a fuel pump 12V light would be a massive addition to fault finding in conjunction with the rev counter.

In this case fuel on but no rpms while engine turning = ignition amp (most likely)

[LPTJoe]

For the OP (And anyone else who stumbles across this thread in the future) I have created a 'how to' guide with picture to show crank sensor replacement.

https://www.volvoforums.org.uk/showt...59#post2435359

[mrmeringo]

Originally Posted by Laird Scooby

Same place as the other red-blocks James!

Joking aside as i've not done one, I can't be sure or give you precise directions but it's behind the cylinder head on the top of the bellhousing, secured by one 10mm hex-headed bolt - don't drop the bolt into the bellhousing!!!!!

As far as i can work out, you need the height, reach and strength of Guy the Gorilla with the manual dexterity and hands the size of a small childs.

Enjoy!

Its exactly were Dave says,under the distributor cap and its a bugger to do,I sliced through all the wires on my 1990 model by doing a pressure wash in engine bay :-( I couldn't get the new one in so have now started to break the car as i was really p***ed off trying to get the new one in.

[LPTJoe]

Originally Posted by mrmeringo

Its exactly were Dave says,under the distributor cap and its a bugger to do,I sliced through all the wires on my 1990 model by doing a pressure wash in engine bay :-( I couldn't get the new one in so have now started to break the car as i was really p***ed off trying to get the new one in.

You're breaking a car because you're struggling to fit a new CPS?

[mrmeringo]

Originally Posted by LPTJoe

You're breaking a car because you're struggling to fit a new CPS?

Yeah, Not well enough to fix it lucky enough i have my my estate to fall back on.Its nearly broke now.