Bad ecu ground? 855r 97 no spark Topic is solved

AndreasJJ · Post by **AndreasJJ** » 06 Jan 2023, 16:21

What can cause no spark even after changing these things?
Crank sensor
Cam sensor
Distrubator
Ecu
Ignition coil (got power but no spark like something is hindering it to signal a spark)
Spark plugs
Plug wires
Got compression
Got fuel
Cams in right place
Any wires i should check at the ecu? Any other wires?

Post by **Chuck W** » 06 Jan 2023, 17:06

I was going to say did you check the main FI system relay that's above the radiator? You said you have fuel though.

Do you have fuel pressure, or just "fuel at the rail"?

AndreasJJ · Post by **AndreasJJ** » 06 Jan 2023, 17:16

Chuck W wrote: ↑06 Jan 2023, 17:06 I was going to say did you check the main FI system relay that's above the radiator? You said you have fuel though.

Do you have fuel pressure, or just "fuel at the rail"?

Yes i have fuel pressure its the spark that is the problem

forgot to mention..sometimes it coughs a tiny little bit like small spark happens and goes away immedietly but thats only SOMETIMES it does that sooo yeah kinda lost

Post by **Chuck W** » 06 Jan 2023, 17:23

What was done prior to the no spark condition? Or did it just not start one day?

AndreasJJ · Post by **AndreasJJ** » 07 Jan 2023, 04:26

Chuck W wrote: ↑06 Jan 2023, 17:23 What was done prior to the no spark condition? Or did it just not start one day?

I bought it non running,the previous owner Said from one day being a daily to one day not start don’t have more info than that

Post by **Sveedy** » 07 Jan 2023, 04:43

Could that little backing plate behind the distributor be installed 180* off ? It has tabs to fit the notch in the back of the intake cam, but it still can mistakenly be installed 180 off. Car will crank but not fire. However this doesn't fit with what the PO told you about how it just died.
But the initial problem might have solved with replacing the parts that you have, and now just that plate could be the problem.
Just a hopeful thought.....

Post by **Chuck W** » 07 Jan 2023, 05:58

You said it sputters occasionally? That means it's getting spark at some point.

A couple thoughts.

You said the cams were timed correctly. Are they timed correctly in relation to the crank? They could be 180* out. (The previous owner may not have been 100% truthful about why it was parked?)
Also, have you checked the ECT (coolant sensor) and its connector? It's winter and you're in Sweden. If that sensor is failed, or the connection is corroded, it can really play havoc on the car starting.

AndreasJJ · Post by **AndreasJJ** » 07 Jan 2023, 07:31

Sveedy wrote: ↑07 Jan 2023, 04:43 Could that little backing plate behind the distributor be installed 180* off ? It has tabs to fit the notch in the back of the intake cam, but it still can mistakenly be installed 180 off. Car will crank but not fire. However this doesn't fit with what the PO told you about how it just died.
But the initial problem might have solved with replacing the parts that you have, and now just that plate could be the problem.
Just a hopeful thought.....

Was thinking of that to but as you say it happened prior to the change but worth a look but i doubt it

AndreasJJ · Post by **AndreasJJ** » 07 Jan 2023, 07:36

Chuck W wrote: ↑07 Jan 2023, 05:58 You said it sputters occasionally? That means it's getting spark at some point.

A couple thoughts.

You said the cams were timed correctly. Are they timed correctly in relation to the crank? They could be 180* out. (The previous owner may not have been 100% truthful about why it was parked?)
Also, have you checked the ECT (coolant sensor) and its connector? It's winter and you're in Sweden. If that sensor is failed, or the connection is corroded, it can really play havoc on the car starting.

Exactly i can get it to ”cough” a bit but no more than that and also it’s only sometimes it happens so some kind of spark exist but feels very small..Yeah Well what i can see the cams is in the right place..but now when you mention it i asked her when i bought when it happened (the non starting) and she Said it happened during the winter? Soo could a coolant temp sensor stop the spark? Hmm maybe i should check that then

Checked the ect sensor now..and there was one damaged wire and alot of corrosion and also something i realised just now my check engine light is non existent not even on ignition but i can read fault codes so maybe just the light is broken

Post by **Chuck W** » 07 Jan 2023, 09:50

AndreasJJ wrote: ↑07 Jan 2023, 07:36
Checked the ect sensor now..and there was one damaged wire and alot of corrosion

Fix this. Any corrosion can cause a bad signal to the ECU. An open , or high resistance ECT circuit will cause a no start, especially when it's cold.

It doesn't cause no spark, it over-fuels, to the point of flooding.

I bet you'll find the CEL bulb pulled, instead of just burnt out.