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#1
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Hello all,
New to the forum, long time Regal owner. Bought the 1984 T-Type in 1984. Sold it to a friend when we moved out of the US in 1998. Bought it back from the friend this week. Here's the problem: It stumbles/hesitates/flashes service engine soon and blows black smoke under moderate load or moderate acceleration. I assume that the black smoke means too much fuel. It's running 40lb injectors with a matching chip. I replaced the air filter and several vacuum hoses. There are no trouble codes stored. I wish I could give you Turbolink data, but apparently the interface box is fried--it won't communicate with ECM. Any pointers on next steps would be appreciated. Thanks! Art Last edited by Art Turner; 08-02-2009 at 03:21 PM. |
#2
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Is the Check Engine light blinking or fluttering quickly?
Can you check resistance across poles of individual coils? These values may reveal a problem.
__________________
Scott Keller - GNTTYPE Founder & Moderator
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#3
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It's flickering randomly, only when the engine is stumbling/cutting out.
Quote:
Thanks! Art |
#4
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Resistance across pairs (1/4, 2/5, 3/6) is around 10,400 ohms. It's an 87 coil with proper adapter to convert.
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#5
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Resistance seems a little low. But I doubt that is the origin of the issues.
The fact that it cuts out in this way might indicate an intermittent wiring connection. The question is what wiring is at issue. Since you are getting the light, it may indicate the engine is momentarily stopping. It could also indicate an intermittent signal from a sensor such as the crank sensor, cam sensor, etc.
__________________
Scott Keller - GNTTYPE Founder & Moderator
Last edited by Keller; 08-01-2009 at 03:04 PM. |
#6
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I was starting to think the same thing...went for a drive in field test mode. The check engine light indicated closed loop (in fact it started in closed loop).
The car would drive normally indicating closed loop. Then it would miss/stumble/cut out and the check engine light would flash erratically at the same time. Then it would smooth out and indicate closed loop. Check engine light never indicated rich exhaust. The PCV valve seems a little loose, and I've had the most trouble with the vacuum line going to PCV, but that seems like that would be more a problem at idle. Art |
#7
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Take a hard look at the ECM connection at the kick panel ... I've seen a lot of corroded terminals/pins if the car ever had a windshield leak in it's life. Water drips right down the A pillar onto the top of the ECM and causes problems.
__________________
Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#8
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Thanks Ken,
Sounds like a good idea. I swapped the ECM (no joy) but didn't look at the terminals. The original ECM is back in. Thunderstorm just chased us inside, so will probably hit it again tomorrow. FYI, crankshaft and cam sensor connections look good. Changed the fuel filter. Fuel pressure was in range, about 37 pounds with ignition on, about 34 at idle. Pressure held steady at a variety of idle speeds. When the engine would cut out, fuel pressure would rise until the engine picked back up. Haven't done a driving fuel pressure test yet. Art |
#9
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Thanks for the input.
There's a chance it was the O2 sensor, but probably what fixed it was... when I was loosening the air-con compressor to get to the O2, I noticed the bolt where all the electrical grounds are connected. It was finger loose and gunked up with grease. Sprayed it with electrical cleaner and tightened up the bolt. Put everything back together and it's running great. So in the end it really was a loose wire. Thanks again, Art |
#10
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For the benefit of the rest of the other 84/85 owners, an you describe where this ground location is located?
__________________
Scott Keller - GNTTYPE Founder & Moderator
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