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  #1  
Old 05-24-2017, 08:37 PM
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85 m110 popping

My car just started backfiring the other day, but it only does it if I'm going down a hill with back pressure on the motor and as soon as I touch the throttle it makes one POP. I'm assuming it is a fuel issue. If any body can help with diagnosing my issue I would appreciate it.

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  #2  
Old 05-24-2017, 08:38 PM
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It's through the exhaust not the intake.
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  #3  
Old 05-24-2017, 08:45 PM
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One more thing I would like to add is injectors are new, and injection k-tronic was rebuilt. I only have about 1500-2000 miles on those parts. And when I start it when it's cold it idles up for a second then almost stalls for second then idles back up. Not sure if that has anything to do with it but I thought I should add that.
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  #4  
Old 05-24-2017, 09:29 PM
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Location: Modesto CA
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Quote:
Originally Posted by mbenz280ce View Post
My car just started backfiring the other day, but it only does it if I'm going down a hill with back pressure on the motor and as soon as I touch the throttle it makes one POP. I'm assuming it is a fuel issue. If any body can help with diagnosing my issue I would appreciate it.
Quote:
Originally Posted by mbenz280ce View Post
It's through the exhaust not the intake.
That version of K-Jetronic incorporates a closed-throttle coasting fuel shutoff; when the throttle is reopened the resumption of fuel flow can cause the pop.


Quote:
Originally Posted by mbenz280ce View Post
One more thing I would like to add is injectors are new, and injection k-tronic was rebuilt. I only have about 1500-2000 miles on those parts. And when I start it when it's cold it idles up for a second then almost stalls for second then idles back up. Not sure if that has anything to do with it but I thought I should add that.
The two are linked; likely the overall mixture is a bit lean. The start sequence may have cold-start injector fuel present, then that is exhausted, then the Warm Up Regulator (WUR) picks up the mixture.
The pop can be caused by a lean condition when the fuel flow resumes; the air flow increases faster than the fuel flow, leading to a brief leanness.

[As to your other post: Expect engine water temp to vary between 80-100C., depending on ambient conditions, and power demand (climbing a grade vs. descending).]
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  #5  
Old 05-25-2017, 05:42 AM
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Thanks for the info. I'm assuming I should probably get the mixture adjusted then(weird though how it just did the popping out of the blue). I know where the adjustment for the mixture is, I'm wondering if it's hard to do, to get it right. And about the temp mine seems to stay between 85-100, so I guess I'm ok there.
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  #6  
Old 05-25-2017, 06:02 AM
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I also wanted to ask if you think that the popping issue could damage the engine
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  #7  
Old 05-25-2017, 08:41 AM
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One more thing that's been kinda bugging me is what is the best fuel to run(unleaded regular, midgrade, or ethanal free super)? Right now I have the ethanal free, I figured it would be better but I was on regular.
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  #8  
Old 05-30-2017, 07:29 PM
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I have another issue when I start it when it's cold it revs up then almost stalls for a second then idles back up. But yesterday I noticed that if I turn the key all the way to engage the fuel pump and do this twice and starting it on the second prime of the pump it starts normal. I was thinking maybe the problem is the pressure regulator on the intake manifold. Or could the accumalator cause this? Frankly I don't even know what the accumalator does.

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