Volvo 940 petrol,went shopping came out car would not start,spark at coil, but no spark at plugs,have replaced everything, had key checked,only thing can think of is I did have to force the tailgate

SOURCE: BMW 320i year2002 e46

I don't think your trouble is on the ignition side of it but I am sure that you must have a look at the idle speed control(stepper motor).
If with temperatuer your "misfire"changes to better, it means that it's probably running too lean at cold, normally the stepper motor or ISC does this job.
Let us know how you get on.
Cheers.

SOURCE: 95 volvo 940 running rough

hello" when i operate my volvo 940GL(1992 model) in mourning the rev engine raise to1700 and donot down to nature rev(750) unless i ignition off engine and ignition on return

SOURCE: Lebaron won't start

I had a similar problem with my 90 LeBaron. It turned out to be the computer.

SOURCE: I HAVE A 1996 INTREPID.

Maybe check the flex plate. I had a 94 concorde with a similar problem. Scanner said it was the cam and crank sensors. The flex plate can get a crack around the bolt pattern which allows it to shimmy when running. throwing off the cam and crank somehow as the mechanic tried to explain to me.

Ginko

• 19396 Answers
• Posted on Sep 01, 2011

SOURCE: 2003 ford Taurus DHOC 3.0

Hi.

The PCM is located in the rear right corner of the engine compartment, sticking to the firewall:


The PCM can be replaced with a new or used god-working one. In both cases the PCM must be reprogrammed using a Tech 2 tool that costs about $3000. The operation is done at the garage.

The PCM is unlikely causing misfire on a single cylinder. Check wires going to spark plugs. If the coil is getting no 12V on the ignition side check ignition. It is strange that one coil has no power, the engine usually does not start when that happens because the same coil gives power to spark plugs on different cylinders.

Check if there is a capacitor fixed to the head aside the coil (there should be one). It should be cylindrical and one inch long, held by a single screw and located aside the coil. If there is a capacitor, that must be replaced with the coil. If you have not replaced the capacitor that is probably involved in the problem.

If you have already replaced crankshaft position sensor, check crankshaft position sensor harness in PCM. I uploaded here the bulletin with CKPS to PCM testing:2003 Taurus CKPK PCM testing.

Test the PCM and CKPS connectors. Check again voltage to coils and spark plug cables. I understood that spark plug cable nr.3 has no spark from coil. Check DC in from ignition to coil.