I'm at my wits end trying to finish my swap.
The car cranks but doesn't sound like it's trying to fire.
I've tested everything I can think of besides a compression test.
The car is a 1991 325i with an obd2 s52 swap.
The motor was rebuilt by a reputable machine shop.
Bottom and top end were assembled by the shop.
I only installed the head on the block so as to leave little room for error.
Timing was triple checked. I had to take it apart after the first attempt was a tooth off and made sure it was spot on afterwards. Engine was rotated several times by hand.
All emissions equipment has been retained.
EWS flashed out by myself.
I wired my c101 using oem crimp pins and the chart here with a couple modifications.
Line routing verified from filter to rail.
System pressure tests good. ~45psi during prime and ~50psi when cranking.
No fuel smell in engine bay for whatever that's worth.
New fuel system components:
- Hoses and clamps
- Fuel pump
- Filter
- Fuel pressure regulator
- Rebuilt 21.5 lb injectors
- Relay
Ignition system:
- New plugs (NGKs, can't remember the part number)
- Low mileage coils and boots all tested at .8 ohms
- CPS is brand new, swapped out with a used one to rule it out.
- Cam sensor is new
- Main relay is new
- Battery is new
- Starter is new
- Plugs are dry and unburned, look like they've never fired.
- No idea how to test for spark, haven't found a good way to do so
Wiring:
- Battery+ voltage at battery and ignition pins 26 49 54 87 at ECU
- New engine ground strap from body to engine mount
- ECU ground at shock tower
- ECU itself in 318i bracket
- All relays terminal 87 are powered up
- Battery+ at injectors and coils.
- Injectors pulse, once a second or so during cranking
- ECU power was originally connected to the fusible link, moved to battery for testing
- I haven't been able to find a value for the updated m52tu cps but I traced the signal wire to the ecu and verified 12v and ground at the cps connector.
- Pulled MAF connector, no difference.
- Replaced ecu
- Check engine light comes on when key is in the run position
- No codes!
If anyone has any ideas I'm all ears.
This shouldn't be a difficult problem to solve, am I missing something obvious?
TIA
The car cranks but doesn't sound like it's trying to fire.
I've tested everything I can think of besides a compression test.
The car is a 1991 325i with an obd2 s52 swap.
The motor was rebuilt by a reputable machine shop.
Bottom and top end were assembled by the shop.
I only installed the head on the block so as to leave little room for error.
Timing was triple checked. I had to take it apart after the first attempt was a tooth off and made sure it was spot on afterwards. Engine was rotated several times by hand.
All emissions equipment has been retained.
EWS flashed out by myself.
I wired my c101 using oem crimp pins and the chart here with a couple modifications.
Line routing verified from filter to rail.
System pressure tests good. ~45psi during prime and ~50psi when cranking.
No fuel smell in engine bay for whatever that's worth.
New fuel system components:
- Hoses and clamps
- Fuel pump
- Filter
- Fuel pressure regulator
- Rebuilt 21.5 lb injectors
- Relay
Ignition system:
- New plugs (NGKs, can't remember the part number)
- Low mileage coils and boots all tested at .8 ohms
- CPS is brand new, swapped out with a used one to rule it out.
- Cam sensor is new
- Main relay is new
- Battery is new
- Starter is new
- Plugs are dry and unburned, look like they've never fired.
- No idea how to test for spark, haven't found a good way to do so
Wiring:
- Battery+ voltage at battery and ignition pins 26 49 54 87 at ECU
- New engine ground strap from body to engine mount
- ECU ground at shock tower
- ECU itself in 318i bracket
- All relays terminal 87 are powered up
- Battery+ at injectors and coils.
- Injectors pulse, once a second or so during cranking
- ECU power was originally connected to the fusible link, moved to battery for testing
- I haven't been able to find a value for the updated m52tu cps but I traced the signal wire to the ecu and verified 12v and ground at the cps connector.
- Pulled MAF connector, no difference.
- Replaced ecu
- Check engine light comes on when key is in the run position
- No codes!
If anyone has any ideas I'm all ears.
This shouldn't be a difficult problem to solve, am I missing something obvious?
TIA
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