What is the cause of this. THe mannual says tune up plugs, wires, cap rotor and a coil, any thing else?

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87 Z28 305 TPI, Auto, Gutted air boxes, K & N fillters, Dyno Max 3" cat back.

 

Some of it is normal...

You might want to add an O2 sensor to your list.

 

If you are talking about an abnormal amount of soot, then you are probably running a little rich, maybe alot. Are you blowing any smoke, what colour is it. black is a good indication of a rich mixture between fuel and air.

get back to us with a few more details
hope this helps you out
C

 

Its alot of soot. The exhuast is only 2 months old and you hit the tail pipe and soot will fall out. The car is seeming to be use alot more gas latly also. One other thing is i get a code 34 after driving at highway speeds for about 20 min. EGR maybe?

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87 Z28 305 TPI, Auto, Gutted air boxes, K & N fillters, Dyno Max 3" cat back.

 

If you do a lot of low speed/stop&go/short trips then it is completely normal. Soot will naturally build up in these cases. Even if you do a lot of high speed/long trip highway driving, you aren't gonna burn out accumulated soot in any short amount of time.
But since your gas mileage is a little worse then you probably do have some other problem (assuming you're comparing similar driving conditions.) i don't know what a 34 is offhand, but you have to fix that before you can even begin to look at anything else.
...ed

 

Wanna hear a good one? My garage floor has two big black spots from where **** flies out of my tailpipes, but my plugs and my oxygen sensor are so clean that you can still see the original semi-shiny metal with absolutely NO buildup at all.

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The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

yeah check ur egr, i dont remember what 34 is off the tops of my head is either but, check it anyhow. the computer doesnt throw codes for nuthin usually.

Steve

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86 Firebird, LG4, t-tops, 2.73 open rear, SLP 3 inch cat back exhaust, catco cat, Coming mods: Edlebrock 1 5/8's Headers, 2 inch cowl hood with custon alumin cold air box, 3.42 posi disc rear, T56, and hopefully a new set of heads and a nice CAM!

My Webpage- Battle of the birds, My own Thirdgen Page, still under construction, http://www.geocities.com/soares711/index.htm

88 Firebird Formula- deseased 2/9/99- 305 TPI, SLP 3 inch exhaust, SLP Intake runners, SLP cam, 3.45 BW disc brake posi, WS6, NOS, and all that good stuff, 13.8 on the motor, 12.89 on NOS and slicks! Hit by what else!?!? a FORD EXPLORER!!!!!!

 

34 is MAF related I believe. The EGR code is 32. Doesn't this site have a listing? I'm too lazy to check

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah