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  #1  
Old 04-29-2002, 08:29 AM
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Engine stumbles and misses?

Hi,

Well here goes, I did a search, but didnt find anything. Car is a 90, 300CE, 24v, 180k miles.

Was driving on the freeway, suddenly, major power loss, car seemed to be suckin air, kind of a burr sound, then slight popping, it will run fine at very light throttle, less than one inch pressed down. Any type of acceleration, more than verry slight, it fumbles and boggs out.

Replaced the plugs, last week, new gas last nite, replaced both fuel pumps, and filter, about 5 months ago.

Could the coil be failing?? Bad gas? Vacuum leak?

Any sugestions are greatly appreciated. Thanks in advance!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #2  
Old 04-29-2002, 09:01 AM
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The coil and/or rotor could cause this. The coil because its capacity has dropped to a point which gets exceeded by the kv requirements of heavier loading. The rotor if the insulative properties break down such that at the higher kv a new path to ground (not through the plugs) takes place.

Fuel pressure could also be a problem although its less likely to be load related. A plugged cat might also cause this.
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  #3  
Old 04-29-2002, 09:36 AM
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Thanks for your responce.

I have spark at the coil and all the plugs, just got done checkin. Now the car wont start at all thou. Idled for about five minutes then stumbled and stalled. It turns over, but no start.

Think it could be a vacuum issue, or a sensor of some sort?
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #4  
Old 04-29-2002, 09:53 AM
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Give the OVP a tap and re-try it.
Check the OVP fuse also.

Tall, aluminum can ,behund panel, back from battery
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  #5  
Old 04-29-2002, 09:55 AM
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Hi,

Took the OVP fuse out it looks ok. Ill tap it and retry that. Thanks for helpin. IM stuck here!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #6  
Old 04-29-2002, 09:58 AM
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Check if OVP is the old one. It will say "Siemens, Austria" on it.
If so , relace it.
Did you use Plat plugs????
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  #7  
Old 04-29-2002, 10:10 AM
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Hi,

sorry for all the posts, but tryin to get it running.

It will idle now, with verry slow gas peddle. If you push the gas peddle any more than an inch, it bogs out.

Good exhast pressure out the tail pipe, and it idle it seems to be fine for about 3-5 minutes then its tumbles. If you press the gas slowly it will remain running.

Im at a total loss for what to check. Any help is greatly appreciated. Thanks in advance!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #8  
Old 04-29-2002, 10:40 AM
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Hi,

No plat plugs, just plain old copper. The OVP relay doest have any name on it, only a benz star. Looks like the original. Were talkin about the one with the fuse on the top of it right?

Thanks for all the help. Greatly appreciated!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #9  
Old 04-29-2002, 10:50 AM
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Yes--- tall, aluminum rectangular can.
What Benz part# ???
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  #10  
Old 04-29-2002, 11:40 AM
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What to check is simple. You need first to verify fuel pressure and then you need to verify secondary voltage requirements. Some of this is a little tricky even with a scope.

I pull a plug wire and see how high the voltage goes (measured between the coil and the dist center term). This tells me available kv (AT THE PLUG). Unfortunately as the voltage goes from the standard 10kv to over 25kv two possible problems can look the same. If the coil can only do 13kv then thats what the scope shows. If the rotor becaomes conductive to ground at 13kv it will look the same. On older models we then would pull the coil wire from the center electrode (slowly - creating an air gap) and view the voltage if it stops at 13kv then the coil is at fault; if it goes to 25+kv then we know its going to ground inside the distributor. In the early 104 as with the 103 the dist is in front of the head with the fan in the way of this last technique.
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  #11  
Old 04-29-2002, 03:15 PM
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Thanks for all your reply's. I droped it off at the shop, figured it was out of my rhelm to figure it out. I'll keep you posted on what it is. Hope its a simple fix

Thanks again! Greatly appreciated
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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  #12  
Old 05-02-2002, 01:48 PM
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Hi,

Well I got the car back last evening. Turned out to be the coil after all. When I checked it, there was spark, but the tech said it was not strong enuf.

Doesnt make sence to me that the coil would have been the culprit, as the car would rev all the way, if the gas pedal was pressed gradually. It only faultered when the gas was pressed abruptly or agressively.

Either way its all fixed. Figured I would update the post incase some one had the same problem in the future.

Thanks again for all your help!
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Dean

Just sold em all !! Curently driving a, 06.5 VW GTI

90' 300CE
Euro Lights w/wipers, Clear corners, 17" Monoblocks, K&N Airfilter, Sportline Suspension, Custom SS single muffler exhaust
80' 300D
96' Harley Davidson, XLH 1200
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