Universal something is wrong with the running of my engine

[Sam-Q]

There are too many questions being posted in regard to engines not running right, I would like all of these to be posted in this thread from now on.


Here is the rough guide on how to post your question in here.


Car model:

Engine type:

Problem:

[lolwat]

fantastic idea

[Sam-Q]

well I hope this clears out this technical area a bit

[Adsie]

Car model: Toyota Sprinter

Engine type: Blacktop 20V 4AGE running Adaptronic with CAS and coilpacks

Problem: Hard to start, running on 2 cylinders


I drove the car to work last week and left it park out during the rain. When tried to start it that afternoon it wouldn't start. Managed to get it started at home with a combination or changing the timing and throttle position. It would back fire out of the inlet occasionally while trying to start. However when it was running it would only run on 2 cylinders (1 and 3). After increasing the revs to above 1500rpm it would start running on all 4 again. Checked all the timing marks on the cams and crank as thought the belt might have jump but that seems fine. Remove the coils from 2 and 3 and can see sparks while its cranking. Also tried spraying easy start down the throttle of 2 and 4 while it was only running on two to see if it wasn't getting fuel. Can anyone sugguest something which may be wrong or what to do next?
Sprin

[Sam-Q]

I don't want to sound patronising but are you sure it's only 1 and 3 that run? not 1 and 4?

[Adsie]

Yeah it's only running on 1 and 3 which I thought was strange as well. Proved this by removing the coilpacks while the engine was running and 2 and 4 did not make a difference.

Did a compression test the other day, that was fine same readings across all four.

[Sam-Q]

well that's quite inexplicable to me. The only thing I can think of is a power or earthing problem, have a look at the coilpack guide on my site and have a look at the wiring pin outs. See if you have a constant +12 and ground when your igniton is on. Otherwise it sounds like a faulty ecu to me

[biggo]

Or water in something

[lolwat]

swap your coils around and see if its the coils(mark them) and if it changes what cylinder is missing the coils fucks
and as above blow shit out with air blower

[Adsie]

Found some bad connections in the CAS wires to the ECU which were fixed then the can ran fine on all cylinders. Then later that day tried to crank it over again and it wouldn't start...

Tested the coils and they are fine also pulled to ECU apart to see if there was water or something in there and that seems fine. Thinking its the ECU now.