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#1
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Where to go next with Misfiring 300TE
Before posting give a quick read of whats in this post please it will take only a minute at most!! I get too many of the same responses.
Car is 1988 300TE with 87,000 miles right now. Compression within 1bar at 185 +- 5 Parts replaced: * OVP * Coolant Temperature Sensor * Injector's+Seals * Non-Resistor OEM Bosch H9DCO's * Ignition Wires * Distributor+Cap * Fuel Filter * Valve Stem Seals * Fuel Distributor * Ignition Coil * Fuel Pressure Regulator * O2 sensor * EHA Valve * Smoke tested for vacuum leaks Where should I go from here? I have no problems accelerating and it only exists at idle. I had my local mechanic smoke test it today so vacuum leaks are off the list!! There is no check engine light on, or any error codes. Rpm's bounce about 50 at idle....It can't be mounts as sometimes it idles perfectly fine, but other times its horrible....very variable...and along with the rpm's bouncing....its not related. You can see the engine is shaking + surging when you pull the hood and doesn't sound as happy as it could be. He mentioned that I have a leaky thermostat housing, but that shouldn't be causing a misfire as my coolant temperature is fine....but I've ordered the gasket to fix that soon anyway.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#2
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It may be normal for your engine, the early 103 engines have camshafts with more duration that the later cams and do not idle as smooth. If you have ruled out everything else you may have to live with it unless you want to spend a ton of cash to replace the cam and followers.
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#3
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Its an actual misfire, I'm pretty sure its not normal. I have spoken to other people (iwrock for instance) who also has an 88 TE and his idles smooth as butter.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k Last edited by ps2cho; 07-15-2008 at 12:27 AM. |
#4
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If you are certain that it is a misfire then I would tend to think it is ignition related. Have you actually had the ignition checked with a scope to visually verify the coil output and oscillation? The only things that seems to be missing from that impressive list is the crank position sensor, ignition module, and the harness from the ign module to the coil. I've only seen that harness bad once but it was a real ball buster to diagnose. If you can put your hands on a known good ign. module it would be worth it to try. The sensor is a long shot but you've seemed to have eliminated all of the "short shots"
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#5
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You replaced all the parts I thought might have been bad...
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2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!) |
#6
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Quote:
I will check coil output (coil is new though) and oscillation. I was going to do the CPS but I decided to go ahead and get her smoked before I spent any more money.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#7
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Have you tried taking it to Mr. MB Motors in Tarzana?
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Paul S. 2001 E430, Bourdeaux Red, Oyster interior. 79,200 miles. 1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron". |
#8
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Ya I took it and he didn't fix it. I was actually kinda surprised. He told me it was a vacuum leak (which it wasn't) and He replaced the suspect hose and it ran a little better but I lost all my power. Ended up that the EHA valve was causing the loss of power...but once adjusted my misfire came back....so it wasn't a vacuum leak at all. He said it would never run better than this as this is as good as that car ran new....
...Don't believe him at all. The idle is horrible so I was kinda surprised based on his reputation.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#9
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Could it be an exhaust issue. Like a back pressure problem?
Just guessing here Or maybe even a worn wiper arm under the fuel/air meter under the throttle body. |
#10
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Quote:
You ought to take it back.
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Paul S. 2001 E430, Bourdeaux Red, Oyster interior. 79,200 miles. 1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron". |
#11
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I don't know if your model fell into the engine harness problems, I think the '88 was before that, but you might check it out.
Ed
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Ed 1960 220 SE Coupe (Ponton) 1999 E320 Wagon 2007 E350 |
#12
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Quote:
He is already 70miles each way....I found another mechanic close by who seems good so far. Well if I had any back pressure, I would have problems, or have hints of problems at higher rpm's....which I don't have at all...if anything it seems to pull harder when getting into the upper rpm's.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#13
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As I said, I am not sure if your model year was in the years with the faulty harness. When they did fail, it was the interior insulation, the exterior looked excellent.
Ed
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Ed 1960 220 SE Coupe (Ponton) 1999 E320 Wagon 2007 E350 |
#14
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The 103 engines do not typically have harness problems. The harness is typically only an issue on the EFI cars (104, 119), not the CIS cars. Then again, anything is possible.
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#15
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I plan to do the fuel pressure first once I can nab the bosch adapter to test it via the distributor. I can find cheap used EZL's on ebay for about $10-$30 so its worth a shot. I'd buy the crank pos sensor new though for sure. Just waiting to move house so I can get back on track...
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
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