What could be causing check engine light staying on? - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 04-19-2006 Thread Starter
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What could be causing check engine light staying on?

I have a "95" 3.8, bought as is with allot of stuff. The C.E.L. was on also when bought. AutoZone says its both sides of exhaust O2's, but couldn't tell if the were up-flow or the down-flow O2's. Just a bit of info, this 3.8 has BBK C.A.I. and a 56mm BBK Throttle bottle, Headers, and an H pipe. There's allot more goodies this car came with but that's a different time. Could the H pipe be causing the C.E.L.? I've done the disconnect battery thing many times and had 2 different AutoZone's clear codes? At the price of O2's , I'm just wondering If I have to ignore the light for now, or by-pass the O2's somehow?




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post #2 of 8 (permalink) Old 04-20-2006
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Quote:
Originally Posted by Beansss95
I have a "95" 3.8, bought as is with allot of stuff. The C.E.L. was on also when bought. AutoZone says its both sides of exhaust O2's, but couldn't tell if the were up-flow or the down-flow O2's. Just a bit of info, this 3.8 has BBK C.A.I. and a 56mm BBK Throttle bottle, Headers, and an H pipe. There's allot more goodies this car came with but that's a different time. Could the H pipe be causing the C.E.L.? I've done the disconnect battery thing many times and had 2 different AutoZone's clear codes? At the price of O2's , I'm just wondering If I have to ignore the light for now, or by-pass the O2's somehow?
What kind of headers does it have?


Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #3 of 8 (permalink) Old 04-20-2006 Thread Starter
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Im going to assume, STOCK SHORTIES? I didnt do the work on this car.



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post #4 of 8 (permalink) Old 04-20-2006
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Quote:
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Im going to assume, STOCK SHORTIES? I didnt do the work on this car.
That's an exhaust manifold, if the guy told you it has headers, that's something different.

IF they are aftermarket headers, you may have to pick up a set of MIL eliminators.

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #5 of 8 (permalink) Old 04-20-2006 Thread Starter
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But they aren't bulky looking cast iron, they are round smooth tubing with weld marks showing.(imagine the V8 shortie headers......... minus one on each side) The bigger part of the question had to do with the H pipe making the dual exhaust, could that be causing the O2's code with CEL?



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post #6 of 8 (permalink) Old 04-20-2006
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Quote:
Originally Posted by Beansss95
But they aren't bulky looking cast iron, they are round smooth tubing with weld marks showing.(imagine the V8 shortie headers......... minus one on each side) The bigger part of the question had to do with the H pipe making the dual exhaust, could that be causing the O2's code with CEL?
No, not unless they removed the catalytic converters.

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #7 of 8 (permalink) Old 04-20-2006 Thread Starter
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(kicking rocks) ........... (grumbles).. figures at nearly $100 per side to start replacing the O2's



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post #8 of 8 (permalink) Old 04-25-2006
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What were the actual code numbers? PO171 & PO174? Which shows lean running on bank #1 & bank #2 ? That's not neccessarily O2's [I got those codes from "auto-zone" on my '95 convert]. My car ran fine with the light constantly on, so I didn't bother any further. I'm not saying this did it, but I went ahead and cleaned my mass air wire, installed an under drive pulley, made my own CAI Ram w/K&N filter and one month later [with regular everyday driving] the light just went off and hasn't come back on. I didn't investigate any further, 'cause if dat light ain't on, it ain't broke!!

'95, white convertable, auto trans, under drive pulley, cai, 3:73 gear. Just enough snap for a 62 year old kid! (my wife's a blond so the top MUST be down, or she won't get in!!)
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