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  #16  
Old 07-10-2010, 03:02 AM
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Quote:
Originally Posted by 400Eric View Post
Quote:
Originally Posted by dproudfo
Also disconnected MAS to see if the idle improved; no result.


It would seem to me that disconnecting the MAS should have caused some kind of reaction, the fact that it didn't makes me think something's amiss with it.

"From what I've researched about a failed ETA is that they either work or they don't. (There isn't an "in between" where they'll cause slight problems)"

When the insulation on all those wires inside those ETAs go bad, they sometimes cause problems, but sometimes they work fine, just like when the main harnesses go bad, stuff works sometimes, sometimes it doesn't. I would think this would be less of an issue on a non-ASR car though. Does your car have ASR?
I still think what is expessed above should be explored.
Regards, Eric
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  #17  
Old 07-10-2010, 05:57 AM
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FYI, you can unplug the ETA with the engine running. I did this on my 400E (non-ASR). The engine hunted around for an idle, but it did not stall. I suppose you could rule out the electrical function of the ETA as the cause of a misfire if you unplugged it while it was idling.

You can unplug it at the end near the module box. It has a spring-loaded canon plug that was engineered by Rube Goldberg.
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Last edited by emerydc8; 07-10-2010 at 06:22 AM.
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  #18  
Old 07-13-2010, 12:01 AM
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Side note that may or may not be related...

When I'm using cruise control...it isn't solid steady...it's as if the car is constantly decelerating and accelerating rather than having a nice smooth throttle.....relation to the ETA? From what I understand this unit controls the cruise control alongside the computer......
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  #19  
Old 07-13-2010, 01:41 AM
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Yes, that may be a smoking gun.

Don't forget what I said about the MAS in my prior post.
Regards, Eric
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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
85 Volvo 744 TD "Bolbo1"
90 Volvo 745 T "Bolbo2"
93 Volvo 945 T "Bolbo5"
85 Dodge F.B. tow rig "Festus"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
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  #20  
Old 07-13-2010, 01:43 AM
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A bad ETA cable can definitely affect your cruise control. I discovered this by accident.

O2 sensor electronics testing
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  #21  
Old 07-14-2010, 10:40 PM
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Slow start....more smoking guns?!

One more note....started the car after work tonight and it was way slower to start than usual. Car was sitting for a good 12 hours so it wasn't a hot start but the turnover time is between 2-3 seconds before firing and tonight it was more like 6-7. Relation to the ETA??
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  #22  
Old 07-14-2010, 11:55 PM
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That sounds like the pump is losing it's prime. does it do that 1-2 hours after shutting off?
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  #23  
Old 07-16-2010, 09:30 PM
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Yeah! I'll check the fuel pumps and the shop this weekend hopefully so I can have a closer look. Either way...the rail could either be losing its pressure during sitting/fuel pump prime problem...or could there be any relation to the ETA on this one?
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  #24  
Old 08-24-2010, 02:01 AM
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Fuel pressure bleed down fixed (blown out upper injector seal on the #1 cylinder). New ETA installed with no change in idle symptoms. I'm seriously running out of options here guys!! Next change is the alternator in hopes there MIGHT be a charging systems problem (long shot). The second option is that the seals within the intake manifold are starting to fail resulting in un-metered air getting into the engine causing all sorts of idle problems. Third on the list, maybe a longer shot are the camshaft position sensors. I'm shooting once again in the dark. Any insights welcome!!!
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  #25  
Old 08-24-2010, 12:54 PM
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i think i would rule out the egr as any possible issue,all that would do is cause a high or low idle,if the plunger had a leak it would be a vacum leak and it would cause a high or erratic idle,if the carbon was clogging it,it would bog down,it doesnt sound like thats your issue,your describing it more like a misfire between cylinders,possible defective coil pack,check your coil,then check your rotor for wear,or exxcesive black spotts or carbon build up,also inspect the inside of the dist cap,if its all black and white its from excessive wear and its arcing out the electrodes are not giving you a fulkl spark to ignite the fuel in the cylinder,you may want to replace your cap and rotor and also replace your ignition coil.this is just preventitive maintenance.
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  #26  
Old 08-24-2010, 02:07 PM
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I dunno....the EGR can do funny things to an engine, if it does have a leak to atmosphere, then it's a vac leak, but it can also leak exhaust gas into the intake tract when it's not supposed to, essentially reducing available vacuum or worse, slightly pressurizing the intake
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  #27  
Old 08-25-2010, 12:18 AM
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Doesn't an EGR problem throw the CEL???
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  #28  
Old 09-06-2010, 08:18 PM
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New Alternator

Another update...new Alternator installed today with no change in idle issue (or ABS/SRS light quirks...previous posts) Here's another note...the secondary harness controlling the alternator/starter is completely shot to hell. There was a pile of insulation on the floor after the job. Potential problems?? (Harness will be ordered in the morning)
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  #29  
Old 09-06-2010, 11:36 PM
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I wouldn't expect the lower harness to cause engine problems. The starter and alternator wires are very heavy duty (see the pictures of my old harness at post #11 E420 Oil Quantity Indicator).
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  #30  
Old 10-23-2010, 10:47 AM
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Ignition Coils and Lower Harness

Just finished replacing the ignition coils and the lower engine harness with no change in symptoms. Anyone have anything else to add to this post? I've exhausted all of my ideas except for MAYBE a manifold leak (as described above). Keep me posted!
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