97` 850 R manual swap, long crank intermittent spark/start Topic is solved

Post by **abscate** » 20 Mar 2016, 07:10

When the no start ( or long crank)( comes back.....what will you do next?

gswede · Post by **gswede** » 20 Mar 2016, 08:34

Good question as I don`t really know what was up with it.. Hopefully it continues to fire

gswede · Post by **gswede** » 21 Mar 2016, 05:59

That didn`t last long. No start today.

gswede · Post by **gswede** » 21 Mar 2016, 07:10

Maybe I should try reversing the sensor polarity?

Post by **abscate** » 21 Mar 2016, 08:05

I still don't think you have a clear decision on ignition vs fuel. You can easily be fussing with the wrong part of the car which is fun, but not very productive

gswede · Post by **gswede** » 21 Mar 2016, 08:20

Fuel pump is running and there is fuel at the rail.
When checking for spark, it comes and goes, not consistent spark.
When no start condition, checked the plugs and they are dry. Something is holding back the injectors. Wires on injector relay looks good and have been re crimped. Have also tried another relay but same condition.

Post by **abscate** » 21 Mar 2016, 09:00

The chances that you have an intermittent failure on both ignition and fuel are pretty small. One of these is the culprit.

What is the fuel pressure at the rail? 15 psi looks a lot like 50 psi if you just see a spritz, but at 15 psi the car won't start

gswede · Post by **gswede** » 21 Mar 2016, 09:21

I hear you. Just put it all back together, crank and crank..no start. Pulled the plugs, bone dry.
Even if pressure was off, injector would still pulse and let fuel into cylinders

Pump was changed for new OEM last year, relay bridged and pressure "looks" good. Dont see how changing transmission would mess with my fuel pressure..

gswede · Post by **gswede** » 21 Mar 2016, 09:41

When cranking spark at coil is very intermittent, for a long time no spar, then a few seconds with spark and so on.
Odd thing is, the longer i crank (after having cranked a minute or two) the more spark i get

gswede · Post by **gswede** » 21 Mar 2016, 10:06

At start og cranking, se end of 1st movie some spark.
Vid 1

Then just after first vid we continued cranking and it came up like this..more spark but inconsistent