1998 Volvo s70 t5m

Sniperboy80123 · Post by **Sniperboy80123** » 22 Aug 2018, 18:43

My 1998 Volvo s70 t5m has an intermittent spark problem I have changed everything from the coil to the ignition switch but when it starts it runs fine just takes a few trys and its not normal plz help problem not solved check fuel PSI and it ok there is no spark and when there is it fires up.

Post by **Ozark Lee** » 22 Aug 2018, 22:18

Have you scanned for codes? There are some codes that will set even when the CEL isn't lit and I think weak or intermittent signals from the camshaft and crankshaft position sensors are just such codes.

...Lee

Sniperboy80123 · Post by **Sniperboy80123** » 23 Aug 2018, 17:01

Yes I have scanned for codes have changed the cam and crank new from pepboys I have also changed the computer and it does the same thing I check the wire from the cam and crank side to side and there is going connect but when the car star it runs perfect no misfire or anything.

Post by **scot850** » 23 Aug 2018, 18:47

I am sorry but I don't recognize your name on here and if you have posted on this issue before. So please help us to help you so we are not just (hopefully) stabbing in the dark or sending you in the wrong direction. I don't know your knowledge/experience on cars or particularly Volvos.

It would be helpful if you can give use the following information:

1) Have all the parts been changed to try to fix this problem or has the problem got worse or started since changing parts?

2) What parts have you swapped out? Please remember to give brands f the new parts as these Volvos are particular on certain brands of parts in some parts of the system.

3) You say the fuel pressure is ok, but what did you get and how was it tested? Again this can help us as these cars are now 20 years old and some parts like fuel pressure regulators can fail causing longer starts while the vehicle tries to get going.

4) Have you cleaned or repaired/replaced any parts of the fueling system like the MAF? Again brand is important.

The fact the car runs well once started is a good thing, but hard starts are not unknown but then there are some fixes too.

Neil.

Sniperboy80123 · Post by **Sniperboy80123** » 23 Aug 2018, 20:22

Yes the parts haves been changed do to the problem the parts that have been changed are the cam sensor part#css1552 brand BwD the crank sensor is Su4107 and the is duralast the coil also had been replaced and the part number is c1090 and that duralast the ignition switch had also been replaced and the part number is ls963 that is duralast but it oem Volvo and the maf has been cleaned out the fuel pressure at prime is at 42-45 PSI and at crank its at 35psi and running its at 36-43 PSI with accelerating the fuel pressure was tested with an injectors cleaner gauge but also works with checking the fuel pressure
...Juan

Post by **misha** » 24 Aug 2018, 04:36

Fuel pump relay or main fuel injection relay on fan shroud(the grey one) could be the culprits.
I would say intermittent chipped key transponder but you guys didn't had them untill '99...but could be also immobiliser problem.

Post by **Clemens** » 24 Aug 2018, 11:29

I thought 98 already had chipped keys...

Also, what about the ignition switch?

Post by **misha** » 24 Aug 2018, 11:36

In U.S they don't.
In EU from '96.

Sniperboy80123 · Post by **Sniperboy80123** » 24 Aug 2018, 12:47

The ignition switch had been changed to see if problem will be solved.

Post by **Clemens** » 24 Aug 2018, 13:28

Thanks, Misha