quote:Originally posted by SPYDER
In an earlier post you said..."it is only running off the crank sensor so the unit cannot detect any engine load, "
So to be clear, it has no TPS or MAP sensor?
Or am I missing something?
It wouldn't be the first time.
If it was forced induction I might suggest reducing the spark plug gap. Worth a try?
I had a similar, but admittedly non load dependant misfire on my Megasquirt install, which was cured by
putting a 10K resistor in line with the VR sensor.
Float bowl fuel levels correct?
Many coil packs have an associated suppressor/capacitor attached? Does yours? Should it have? Is it faulty?
Correct, no MAP sensor or TPS just the crank signal.
Checked the needle valve height but haven't measured the fuel level in the bowl.
So I first off checked the fuel levels in the bowls, one carb was off by about 5mm so adjusted the floats so they are both the same and are approx
26mm +-1mm.
Drove the car and again it's no different.
Crank sensor finally turned up and fitted it to the car.
Drove it and it's no different.
It wasn't running particularly well stationary tonight but still would rev past 3000rpm, probably needs an idle adjustment after the float level
change.
Was suggested to try pulling the choke out while its not reving to see if extra fuel would make any different but that didnt do anything either.
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Building: PROCOMP LYNX LMP & PROCOMP LA GOLD
posted on 28/9/19 at 01:19 PM
When you changed engine was the flywheel changed also or is the new engine and flywheel as it came as complete know running unit Ok.
Reason for asking is that when changing the CPS for a new one it might not be the actual CPS at fault but the housing it fits into. There are 2-3
different housings with differing CPS location within the housing for the Zetec and if the housing and flywheel are not in correct positioning to each
other you will get what shows as a CPS issue but its not the actual CPS at fault but its location.
Hope that makes sense.
Yeah it does make sense and something I had been thinking about. The flywheel was swapped over along with the crank sensor from the original engine
that came with the car. Which from memory was a 1997 silvertop. The crank sensors did look the same but if the blocks are different then that would
cause an issue.
How do I check?
Original engine was a Nov 1997
Current engine is a May 1992
The 10K resistor is a well known fix in the Megasquirt community. The problem is noise related and can cause the ECU to miss-read the missing tooth.
It's more common on 60 tooth wheels but can show up on 36 tooth types.
To correct my earlier post.... the resistor goes INLINE with the crank sensor, not across it.
quote:Originally posted by procomp
When you changed engine was the flywheel changed also or is the new engine and flywheel as it came as complete know running unit Ok.
Reason for asking is that when changing the CPS for a new one it might not be the actual CPS at fault but the housing it fits into. There are 2-3
different housings with differing CPS location within the housing for the Zetec and if the housing and flywheel are not in correct positioning to each
other you will get what shows as a CPS issue but its not the actual CPS at fault but its location.
Hope that makes sense.
Matt
Does that imply that the flywheels can be different?
If the CPS is the right one for the block (which is what I ordered) then it should be in the right place? But if the flywheels different as well then
it would read wrong.
quote:Originally posted by SPYDER
The 10K resistor is a well known fix in the Megasquirt community. The problem is noise related and can cause the ECU to miss-read the missing tooth.
It's more common on 60 tooth wheels but can show up on 36 tooth types.
To correct my earlier post.... the resistor goes INLINE with the crank sensor, not across it.
We are going to check the signal with an oscilloscope along with the ECU signal to the coil pack.
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Building: PROCOMP LYNX LMP & PROCOMP LA GOLD
posted on 2/10/19 at 10:50 AM
Re flywheel differences, depends on a few things such as Fiesta, CVH, Zetecs 1.6 1.8 2.0 Etc Etc but we have had issues with swapping some lightweight
flywheels from old to new engines when not changing the complete CPS and housing.
quote:Originally posted by procomp
Re flywheel differences, depends on a few things such as Fiesta, CVH, Zetecs 1.6 1.8 2.0 Etc Etc but we have had issues with swapping some lightweight
flywheels from old to new engines when not changing the complete CPS and housing.
What do you mean by housing? It bolts directly to the block, or am I missing something?
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Building: 2 litre zetec, live axle, throttle bodys and megas
posted on 5/12/19 at 10:02 PM
If you are using the advance curve on the top line of the map then it has probably got to much advance at 3500 and above , what happens if you reduce
it to about 15 degrees across the map.The figures across the top of map are more like wht it should have on overrun.
Paul
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