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  #1  
Old 03-18-2010, 09:31 AM
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Location: Houston, Texas
Posts: 325
Houston Tx area shop to test fuel injectors?

My '82 240D has started to nail/ping at idle after the car is warm. It does it after I have driven at high speeds and when the car is at idle. It goes away after a while but it only happens during idle. I've run 2 cans of diesel purge which helped but it still has a definite nailing after a high speed run.

Anyway, I want to get the injectors looked at by taking them to a diesel shop. Does anybody have any recommendations in the Houston area where I can take the injectors to be tested/cleaned?

Thanks
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  #2  
Old 03-18-2010, 10:55 AM
compress ignite's Avatar
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Location: 32(degrees) North by 81(degrees) West
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Houston

Bosch Diesel Service Station:

M&D Distributors, Inc.
6950 N. Shepherd Dr.
Houston, TX 77091
USA
Phone: 713-699-4100
Fax: 713-699-1938
Factory Trained For: A, MW, P,P7,P8, VE, VE-M, EDC , H, VR, CP3, TICS, RED-III, RED-IV, SPGH, ZW
Seal #: 4466

Me? Though,I'd contact member C Sean Watts about a set of New Superior
Monark Injector Nozzles...He can install the new nozzles and shim + pop test
them for you...VERY reasonable Prices!
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  #3  
Old 03-18-2010, 02:17 PM
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Interesting. I've never heard of Monark...I've heard of Boisio or something like that.
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Old 03-18-2010, 03:04 PM
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Quote:
Originally Posted by airfoill View Post
Interesting. I've never heard of Monark...I've heard of Boisio or something like that.
M&D has a location on Navigation, too. I don't know if that location is closer to you than the N. Shepherd location is.
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81 MB 300SD, 82 MB 300D Turbo (sold), 04 Lincoln Town Car Ultimate

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  #5  
Old 03-18-2010, 04:34 PM
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Location: Houston, TX
Posts: 107
M&D Experience

I'm in the middle of dealing with the M&D people on Shepherd. Background is that about two weeks ago they installed new Monark nozzles (supplied by me) onto my injectors, and also cleaned, tested and balanced them. Cost was $27.30 per injector (not including the nozzles, of course) and turnaround was one day.

I installed the injectors and one of them nailed. I pulled it and took it back to them and asked for an explanation. They took one look at it and concluded that the injector tip had not seated properly against the heat shield and detonation was sneaking past the heat shield and hitting the nozzle. They told me to (again) clean the surface where the heat shield rests, drop in a new heat shield and reinstall the injector. I did that and it still nailed.

A few days later I noticed that this same injector was leaking from between the top and bottom half. Pulled it, took it in. They had it for a few hours and determined that, once again, it was not seated properly against the heat shield, was being exposed to detonation and this was causing the leak and the nailing. They cleaned up the injector, tested it and pronounced it good. I reinstalled with a new heat shield and - surprise - it still nails. That was yesterday.

To their credit M&D has turned my injectors around in one day or less both times they have had them (once for the nozzle install and once for the repair), and they haven't charged me for either subsequent service on the faulty injector even though (a) they explicitly disclaimed any warranty because I provided my own nozzles, and (b) they seemed convinced that any problems were my fault and not theirs.

I don't yet know if the nailing issue is truly due to my own faulty installation (three times in a row??) or due to some sort of shortcoming in the quality of their service. I am in touch with a mechanic who is going to diagnose the problem for me (he seemed convinced based on my description of the problem that the injector spring settings are amiss) and if it truly is an issue with the injector he is going to "raise hell" with M&D until they fix it properly.

Also note that they will not work on Mercedes automobiles. They will only service the injectors themselves, meaning that you have to pull them and take them in yourself, and reinstall them yourself, and be comfortable doing everything that those actions entail. And if something isn't working right, you can't just drop your car off there and tell them to "fix it."
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  #6  
Old 03-18-2010, 08:02 PM
compress ignite's Avatar
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ANY Bosch replacement Nozzles

Are most likely to be of the Dreaded Indian Subcontinent manufacture.
AND will be of 'Orrible Q.C.

The Monark (Made in Germany) Nozzles tips are Much,Much more finely machined than even the original Bosch of 20 years ago.
The Monark's spray pattern is more consistent and Much quieter @ Idle.
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  #7  
Old 03-19-2010, 06:38 AM
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So if I order the Monarks, there is no guarantee that I will get the German made nozzles and may end up with the Indian nozzles.
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  #8  
Old 03-19-2010, 08:46 AM
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Location: Houston, TX
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Quote:
So if I order the Monarks, there is no guarantee that I will get the German made nozzles and may end up with the Indian nozzles.
No. The Monark nozzles are all made in Germany. The Bosch nozzles are made in India or somewhere around there, and according to others suffer from poor quality controls. I have never used the Indian Bosch nozzles, but I can tell you that I experienced an immediate and profound improvement with the Monark nozzles, despite my continuing nailing issue.
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  #9  
Old 03-29-2010, 01:59 PM
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For anything on my MB I would take it to MPH Automotive, Hwy 6 and I-10 area. These guys know their stuff. I moved to Dallas in 2002 and for anything other than an oilchange i will take the car to them.

Fred
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