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#1
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86 300E hard to start and runs rough
Great site, and I hope someone out there has an answer to my
mysterious problem. I have an 86 300E, 5 speed manual (145K miles) that now refuses to start or when it does it runs very rough. Another symptom has been that when it sits unstarted for a week or so it would start, run rough, quit after a few minutes then after it sat for a few hours start up and run fine. The last time it sat for a week it just refused to start and is now at the mechanics. It has been at my mechanics for a month and he has tried: new plugs, check the fuel pressure, says it is good, checked both the fuel pump and overload relays tried a new control unit from another 300E along with a few "rebuilt" ones. Nothing seems to fix it. My other ideas are: O2 sensor, and wiring harness. Mechanic thinks there is a timing problem but I am not so sure given previous history above before the latest problem. Help!! |
#2
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It's time for you to replace those brittle vacuum hoses under the hood.The vacuum lines are sold at autozone for 99 cents a foot. $2 should get you enough line hose. A bottle of Techron in the gas tank is recommended. Get a new air filter, and clean the throttle plate with carb cleaner.
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1987 mercedes 300E 1995 e320 conversion(hated the 300e grill) HID/Xenon (D2S) Keyless Entry Monochromatic Paint (Custom Blue) Smoked Tails Flat Badged (front) Debadged (rear) custom "carbon fiber" console 18 inch HP EVO rims Sold! Now I drive a Monte Carlo SS http://memimage.cardomain.net/member.../352975_67.jpg http://memimage.cardomain.net/member.../748335_24.jpg |
#3
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Thanks, I hope it is that simple. Sure has stumped my
mechanic. |
#4
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Symptom sounds MOST like intermittently plugged injectors. Best case, run a couple bottles of Techron/full tank, hope it helps. If not, a complete purging of the fuel system and replacing the injectors may be necessary in the extreme case.
Steve
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'91 MB 190E 2.3 '08 RAV4 Ltd 3.5 '83 Lazy Daze m'home 5.7 |
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