Car wont start. Cranks over but doesnt fire. Happened a few weeks ago, one day just would not start in morning. Couple days later fired right up. Once started runs well.

Not a daliy driver. Did it again, cant get it started. Tried a new ovp, got a 2 fuse one from fastlane to replace the 1 fuse one, is that ok?

Got spark at coil wire. One time turing over, thought I heard one cyl go to fire but then nothing when it continued to crank.

maybe crank sensor? fuel pump relay? Anyway to by-pass either?

Any help would be appreciated.

Thanks, Jeff

Off the top of my head: check that both of your fuel pumps are firing. If so, is your fuel system maintaining pressure after shutdown? --- fuel pump check valves need to be checked as well as the fuel accumulator.

Your MAS Sensor is your fuel relay on the '92 ... take it off and jump pins 1 and 2 (off top of my head again) with a wire to fire up the fuel pumps. Again, ensure both are working.

Remote possibility -- clogged fuel filter.

Good Luck

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

ok, thanks, I'll try jumping the pins at the mass.

Kinda cold up here in RI, if it warms up, I'll venture under the hood.

How do I tell if both pumps are running, just feel with fingers to feel them running? Are the fuel pumps under the car? I can't tell by the pages in the manual, just guessed they are.

Thanks, Jeff

looking at the manual, if I find the versions right, I think it says for 1992 300E to jump pin 11 and 20 of the mas to energize pumps.

Can anyone confirm this? Don't want to blow anything by jumping wrong pins.

Thanks, Jeff

I had the same problem a week ago. Found out the little adaptor bracket which is located behind the rotor arm had broken. Take the distributor cap off, remove the rotor arm and see if that is the cause.
Colin.

__________________
92 Mercedes 300E 2.6
86 Plymouth Conquest TSi
79 Chrysler Cordoba (without Corinthian Leather!)

DRIVE FAST TAKE CHANCES!

crazy, thing started right up with not doing anything else.

Dave R here, Staten Island NY.. 1993 300TE 4matic...I have the same condition. If you have spark all the time during a no start condition, your half way home. If you think your problem is fixed just because the engine started today, Im sorry, its not. Test the CPS just to make sure its in spec: 750 to 780 Ohms resisitance, and .460 to .505 AC scale when cranking. Its the smallest round plug on the EZL (Ignition Module, top of drivers side front wheel well,) and its lead is half looped thru a wire tie down strap. Test pump voltage at both pumps, they are wired together from the MAS module. You need 12.5 vdc there solid, or maybe 10.8 vdc while cranking. Hook up fuel pressure guage to end of fuel filter (output side)with a T fitting, I understand you need 70 to 80lbs. PSI there. If you have nowhere near that, change the filter. If still no pressure, block the fuel accumulator return line with a small cut down drill bit or drill rod, and small piece of fresh fuel line with small hose clamps but do not pinch it. An old fuel line will crack on you and leach rubber particles into the fuel system. If the pressure comes up and the engine starts, thats it. If not, the pressure might try to climb a little during cranking, and you eventually might start to get some popping (engine trying to run), then Its probably a bad fuel pressure regulator. (expensive) I wouldnt recommend blocking its return line, without carefully watching the FPG, and be ready to stop cranking when your FPG hits 80psi or so. Over pressuring the fuel distributor body, might harm it. Fuel screen in tank clogged? When you add the T fitting to check the pressure, put a clear line on the T part and into a clear container to check fuel flow first when cranking. Its like 1 quart in about 40 seconds. If you do unscrew that big (drain plug-pickup screen) from the center of the tank,(if you have one), you must have a new O-ring to reinstall it with! If the damn rain ever stops here, Ill check my pump pressure too..... if your going to crank alot, and have a crummy battery, take out 3 or more plugs, it will be easier on your starter....
One or more of the pumps could be bad also. if you have to, take them out and bench test them if everything else has failed. If you do bench em, do it outside for safety and observe the pumps power polarity. Check which is the positive lead before you take em out while cranking. And test them for pressure @ at least 70 to 100psi....Dont let them sit running for more than 5 seconds, you might stall the motor and burn the brushes from over pressure.

thanks Dave sent you a private message, pls look.