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Old 09-18-2006, 12:34 PM
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1994 buick roadmaster

we have a 1994 buick roadmaster and when we turn it on the side where spark plug 1,3,5 and 7 are on throw out black carbon looking stuff we have changed out 4 fuel injectors,the fuel pump,the fuel pressure regulator and all the spark plugs we don't know what to try next once the car warms up it stops throwing this stuff out any ideas on what his might be thanks for the help

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Old 09-29-2006, 08:14 PM
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1994 Buick Roadmaster

This is a guess!

The left side of the engine is running rich. It stops throwing out black carbon when it gets warm.

The right side is running fine.

The problem is on the left side....So what is affecting the left side. Is there an exhaust crossover control not working ? any cold engine heating devices that are affecting the left side? Any coolant restrictions?

Russ
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Old 09-30-2006, 01:56 AM
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Hmmm if you can't find the answer here, you can always check Buick Forums:

http://buickforums.com/forums/forumdisplay.php?f=22

Also there is ImpalaSSForum, but its down atm.
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Old 09-30-2006, 09:01 AM
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Yes, the Impala SS Forum has been up and down a lot lately since they changed servers.
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Old 09-30-2006, 05:17 PM
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When you scan the PCM data, do you see fuel being added or taken away. What is the injector on time doing incomparison to the other injectors. Are you getting a good coolant temp reading? I don't recall, is there a heated O2 sensor and if so is it heating? An incorrect O2 reading could be driving the injectors richer than needed. Also, I remember an issue with the intake gasket around the #5 cylinder.
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Old 10-01-2006, 07:08 AM
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The intake gaskets can always mess up the O2 readings... I check the torque on the bolts of my '94 SS regularly. I also use DataMaster on my laptop to look at the PCM data while it's running (great program for the LT1). If nothing else, I'd probably change the O2 sensors. If they're the original ones, at least one of them is most likely dead by now.
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