Sparkie
Senior Member
Offline
Looking for advice for my 280i. Familiarity with the Bosch Jetronic injection would be invaluable.
Current symptom: Runs very strong for a few miles, followed by short periods of engine cut-out. Not individual cylinders dropping, but total cutout. The engine didn't die, as I left the clutch/gear engaged and the engine eventually cleared and ran well again (for the entire return trip of 1 to 2 miles). Suspect fuel flow issue.
Recent issue: Wouldn't start (very unhandy at midnight as I was trying to impress the wife with the drive home from a party). Immediately suspected lack of fuel and diagnosed to dead fuel pump. Found a length of silicone gasket material sticking out of the pump intake snout - loosened by injector cleaner????
Anyway, replaced pump and added 40 micron screen filter in front of pump. Engine still wouldn't start, yet I now had fuel pressure. Boned up on Jetronic manuals and diagnosed to warm-up valve - regulator plunger stuck preventing no enrichment during startup. Figure that one out with no relation to dirty fuel, as the plunger is not on the fuel side of the circuit. Sitting too long?? Rebuilt warm-up reg and everything is fine - except for intermittent cutout.
Suspicions: The filters (replaced the very large post-pump Bosch canister filter) stops debris getting into the mechanical metering unit and injectors - but am I facing sediment buildup after the filter due to this 20 year vehicle that has only 12K miles on it??
I purchased an electrical fuel pressure gauge to monitor in the cab during the next event - hasn't arrived yet. Interested in ideas to work on getting reliability into this machine. Not looking forward to entire fuel system disassembly and cleaning - options?
thanks,
Current symptom: Runs very strong for a few miles, followed by short periods of engine cut-out. Not individual cylinders dropping, but total cutout. The engine didn't die, as I left the clutch/gear engaged and the engine eventually cleared and ran well again (for the entire return trip of 1 to 2 miles). Suspect fuel flow issue.
Recent issue: Wouldn't start (very unhandy at midnight as I was trying to impress the wife with the drive home from a party). Immediately suspected lack of fuel and diagnosed to dead fuel pump. Found a length of silicone gasket material sticking out of the pump intake snout - loosened by injector cleaner????
Anyway, replaced pump and added 40 micron screen filter in front of pump. Engine still wouldn't start, yet I now had fuel pressure. Boned up on Jetronic manuals and diagnosed to warm-up valve - regulator plunger stuck preventing no enrichment during startup. Figure that one out with no relation to dirty fuel, as the plunger is not on the fuel side of the circuit. Sitting too long?? Rebuilt warm-up reg and everything is fine - except for intermittent cutout.
Suspicions: The filters (replaced the very large post-pump Bosch canister filter) stops debris getting into the mechanical metering unit and injectors - but am I facing sediment buildup after the filter due to this 20 year vehicle that has only 12K miles on it??
I purchased an electrical fuel pressure gauge to monitor in the cab during the next event - hasn't arrived yet. Interested in ideas to work on getting reliability into this machine. Not looking forward to entire fuel system disassembly and cleaning - options?
thanks,