I apologize for the length of this post but I’ve been at this for some time and really need some independent insight and wisdom. This is an expanded presentation of my previous "bad coil?" post.
1985 325E Manual Gbx
Problem: Intermittent, unpredictable stalling, not consistently connected to any identifiable timing, driving action, or driving condition. Sometimes the engine just quits – sputters to a stop – most of the time it recovers. When it happens at start-up, putting it in gear and disengaging the clutch to drive off sometimes seems to straighten it out immediately, other times it takes few blocks. These episodes are usually short and it runs very well in between time, sometimes it has gone weeks with no problem. Except that it has now been getting worse the last couple of weeks, and finally stalled for good. Starter spins the engine, but no start, only a vague hint it might want to.
The problem(s) started after dropping in a good used engine because the original dropped a rod cap at 300,000 miles. This was a straight forward, no adaptations needed transplant.
The following is the information from my trouble shooting.
1 Fuel:
a. Transfer and main pump are working and delivering flow and pressure within spec.
b. So, fuel pressure regulator is assumed good, and has no fuel in vacuum line.
2 Ignition:
a. There is spark at the plugs. Plugs are somewhat black suggesting a rich mixture but otherwise in good condition.
b. The plug/coil wire resistance is within spec
c. Primary coil voltage is good
d. Coil resistance is 17% to 20% over spec (Primary .05, Secondary 5k): measured -.6-.8, 5.89k
e. Distributor cap tower resistance: 10 ohm, no visible cracks, no major pitting, but clearly used.
f. Rotor resistance: 1153 ohm
g. Reference and speed sensor resistance within spec.
3 Fuel injection:
a. Pressure and flow is good
b. Engine won’t run so cannot verify injector function with engine running.
c. Injector resistance good.
d. There is battery voltage at injector connector
e. Each bank “clicks” when the Motronic connector terminals are tested per manual.
4 Motronic Unit:
a. All tests per manual at the connector are within spec.
b. Except:
i. Starter input not tested
ii. Coolant Temp sensor – resistance OL
iii. O2 sensor – resistance OL
5 Cold start injector may be not functioning, does not show any leakage, but is not likely to cause the present problem.
1985 325E Manual Gbx
Problem: Intermittent, unpredictable stalling, not consistently connected to any identifiable timing, driving action, or driving condition. Sometimes the engine just quits – sputters to a stop – most of the time it recovers. When it happens at start-up, putting it in gear and disengaging the clutch to drive off sometimes seems to straighten it out immediately, other times it takes few blocks. These episodes are usually short and it runs very well in between time, sometimes it has gone weeks with no problem. Except that it has now been getting worse the last couple of weeks, and finally stalled for good. Starter spins the engine, but no start, only a vague hint it might want to.
The problem(s) started after dropping in a good used engine because the original dropped a rod cap at 300,000 miles. This was a straight forward, no adaptations needed transplant.
The following is the information from my trouble shooting.
1 Fuel:
a. Transfer and main pump are working and delivering flow and pressure within spec.
b. So, fuel pressure regulator is assumed good, and has no fuel in vacuum line.
2 Ignition:
a. There is spark at the plugs. Plugs are somewhat black suggesting a rich mixture but otherwise in good condition.
b. The plug/coil wire resistance is within spec
c. Primary coil voltage is good
d. Coil resistance is 17% to 20% over spec (Primary .05, Secondary 5k): measured -.6-.8, 5.89k
e. Distributor cap tower resistance: 10 ohm, no visible cracks, no major pitting, but clearly used.
f. Rotor resistance: 1153 ohm
g. Reference and speed sensor resistance within spec.
3 Fuel injection:
a. Pressure and flow is good
b. Engine won’t run so cannot verify injector function with engine running.
c. Injector resistance good.
d. There is battery voltage at injector connector
e. Each bank “clicks” when the Motronic connector terminals are tested per manual.
4 Motronic Unit:
a. All tests per manual at the connector are within spec.
b. Except:
i. Starter input not tested
ii. Coolant Temp sensor – resistance OL
iii. O2 sensor – resistance OL
5 Cold start injector may be not functioning, does not show any leakage, but is not likely to cause the present problem.
Major Driveability Problem.
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