[W126 Coupe] 89 560 sec with engine miss and rich, poor idle

[jflyer2 at aim.com]

You can buy a new grill. The trouble is that they cost around $600.


-----Original Message-----
From: Al Hollis <alhollis at charter.net>
To: rickard681 at cox.net; Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Sent: Thu, 19 Jul 2007 3:34 pm
Subject: Re: [W126 Coupe] 89 560 sec with engine miss and rich, poor idle


My chrome is coming off the grille near the star (89 560SEC). Does anyone have a fix for this or knowledge where to find another grille??
?
Laurie?
?
----- Original Message ----- From: "Rick Granlund" <rickard681 at cox.net>?
To: <mbcoupes at mbcoupes.com>?
Sent: Thursday, July 19, 2007 1:28 PM?
Subject: [W126 Coupe] 89 560 sec with engine miss and rich, poor idle?
?

> HI-?

> I don't mean to bother the list, but I have qa rather sever problem with > my '89 SEC. I tried earlier but did't get any takers in trying to > diagnose the problem. Hoping someone will chime in with the solution to > my problem.?

> thanks in advance.?

> Here is the problem:?

> The car?

> does not appear to have any enrichment when first started, but acts like?

> more than one injector is running wide open. When it is first started,?

> cold, it will stall unless you give it enough gas (1000rpm or more.?

> After about 30 seconds you can let it try to find idle, but it hunts?

> between ~500rpm and ~800-900rpm or stalls. The exhaust is VERY rich (it > stinks?

> with fuel). I bought the car with a broken ( front vacuum?

> tube nipple)fuel pressure regulator and the idle was erratic and had > bumped up to?

> 1000 - to 1400 rpm isong the throttle linkage (the one link down under the > front of?

> the throttle body, just behind the cruise linkage. It would still stall?

> and hunt up to 1400rpm. I replaced the fuel pressure regulator.....no?

> change! So I replaced the Idle control valve....no change! I seems to?

> have a severe miss....running on seven, but it does that well above idle > too.?

> The miss is it running very 'rich'. I replaced the distributor cap?

> and rotor and the plug wires thinking it was an electrical miss.....no?

> change. It appears just to be a very rich condition....all the time. It?

> will not idle, just hunts 400 to ~900 rpm and stalls. After stopping, it > is very hard to start...like leaking injectors.?

> I am thinking this rich condition is controlled by some electronics,?

> rather than a faulty injector....it just runs too rich.?

> Could someone guide me through the logical troubleshooting steps to > get?

> to the bottom of this problem? How do I check if the cold start injector > is 'open' all the time. Removing the electrical leads to it does nothing.?

> I think if I can find the reason for the ery rich idle and run condition, > it will solve the idle and 'miss' the car has at idle and in running.?

> Rick?

> The MB Coupes Website!?

> W126 SEC Mailing List?

> Postings remain property of MB Coupes, L.L.C.?

> ?

The MB Coupes Website!?
W126 SEC Mailing List?
Postings remain property of MB Coupes, L.L.C.?


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