Question for the Ford Gurus

[SATAN]

All right, went down to the FFW in Orlando this weekend and the car started doing something odd. It was fine when I was leaving the track Saturday night, after I had filled up the gas tank the night before with no prior ill-effects. Sat night I also did a 3rd gear roll-on with another Cobra that went to about 120 mph and didn't notice anything. But shortly after that as soon as I got into the boost with a decent load on the engine I started to hear some detonation/spark knock. The car did it all the way back to my buddies house and still did it the next morning with the car dead cold, so it's no a heat soak issue. I put some 104+ in the tank and had no real change in the condition. I have since run that tank of gas almost dry and filled up the tank again and the car is still detonating under the same conditions. This morning I pulled the codes and the only ones are the same ones I've had since I did the exhaust, rear O2 codes (they aren't in the car right now). Does anyone have any ideas? BTW, the car is a 2003 Cobra with a smaller blower pulley, cold-air, throttle body, programmer, and full exhaust, and this is the first time anything like this has happend.


Any GOOD help is greatly appreciated,
Lloyd

[boostedsvt]

did you check your plugs?

[willjs7]

Did you change the plugs after you did those mods?

[GMMAN]

Disconnect your battery for about an hour. See if that helps any. :shrug:

[BreBar21]

Hmmm...knocking is never good. What programmer are you using and what size pulley? Upper/Lower combo?

[SATAN]

Hmmm...knocking is never good. What programmer are you using and what size pulley? Upper/Lower combo?


Stock lower with a 2.8" upper, good for about 14-15 psi. The programmer is Diablo Sport, not very happy with it though. As far as the plug questions go, still the stock plugs, but I did the mods over 8,000 miles ago, so if it was a heat range issue, they should have given me problems long ago I would think. Well, if it's not raining tomorrow morning before I go to work, I'll pull a couple of plugs to see what they look like.

Lloyd

[SATAN]

Just pulled 2 plugs, gotta go to work don't have any more time, and they look like shit. I knew the car was running rich, but nothing like this. Both the plugs are soot black. The weird thing though is there is a reddish deposit on the end of both plugs, never seen anything like it before. The only thing I can think of is if the 104+ I put in there left the deposit? I also cleared the KAM while I was checking the plugs so maybe that will help.


Lloyd

[Gt]

Yup, the 104+ will leave reddish deposits on the plugs.

[SATAN]

Well I believe I've got it figured out. Going on info from a friend who's a damn good driveability tech at All American I checked the boro value (it's supposed to be a minimum of 155hz), it's a little low, 27.8hz. Hence the MAF is FUCKED. He said what happened is oil from my K&N filter sucked into the element in the mass air and basicaly corn-holed the meter. So I need a new mass air. Hell, it could be worse, now all I have is an excuse to buy some new Hoo-Ha parts.

Thanks for the help,
Lloyd

[Gt]

U can clean the MAF with q-tips and either brake cleaner or carb cleaner (one of them leaves no residue I will always forget which is which.). Just try the cleaner first, if that doesn't do it. U can use a q-tip very LIGHTLY on the wire.

[SATAN]

U can clean the MAF with q-tips and either brake cleaner or carb cleaner (one of them leaves no residue I will always forget which is which.). Just try the cleaner first, if that doesn't do it. U can use a q-tip very LIGHTLY on the wire.


Already tried, twice. Tried swabing it first, no results, then I soaked it in cleaner fluid, still didn't work. Oh well, fuck it, I now have a perfect reason to buy a Kenne Bell!!! Don't ask me to explain the reasoning in my brain, but it makes sense to me!!!!!

[Bullhead00]

Yeah, looks like you're going to need to replace your blower with a KB. Oh well, crap happens.

[SATAN]

Yeah, looks like you're going to need to replace your blower with a KB. Oh well, crap happens.


Sombitch huh?

[broke]

did you ever solve the problem??

change the fuel filter lately???

[01COBRA]

His MAF was shot.

[rjcobra]

Stock lower with a 2.8" upper, good for about 14-15 psi. The programmer is Diablo Sport, not very happy with it though. As far as the plug questions go, still the stock plugs, but I did the mods over 8,000 miles ago, so if it was a heat range issue, they should have given me problems long ago I would think. Well, if it's not raining tomorrow morning before I go to work, I'll pull a couple of plugs to see what they look like.

Lloyd
Was it a custome tune or the canned Diablo pulley tune?

[BreBar21]

Was it a custome tune or the canned Diablo pulley tune?

I believe it was canned.

[SATAN]

Was it a custome tune or the canned Diablo pulley tune?

Original tune was the generic Diablo Sport 2.8" pulley tune. Now is a complete SCT by JMS tune-up. BTW JMS kicks ASS.