Check Engine Light going on - need some help

USMC302 · 08-10-2007, 10:04 AM

Two things I would change....Platinum plugs, throw them out and put in some autolites, next, go back to advanced auto and tell them they gave you the wrong sensors or harness for them, your right about only having 2. If you use a harness for four sensors, the signal will be reporting four a/f ratios and two of them aren't in so they're seeing no fuel now(hence the ECU reporting a lean condition), get the one for just the two sensors. I would bet lots of money that is your problem....

goodyear1984 · 09-21-2008, 01:00 PM

up stream sensors measure fuel downstream are there to measure if the cats are cleaning the exhaust fumes.with out the upstream sensors inthe right spot they wont measure fuel

USMC302 · 09-21-2008, 01:37 PM

Thanks Goodyear, hopefully, she's not still having this problem. lol

jmdesales · 03-18-2009, 07:45 AM

I know this post is super old but if you stumbled on here, RE: MAF, Remove MAF, spray the wire element inside the MAF down with brake cleaner, wait 15 min to dry completely, the wire will look and perform good as new. Do not stick a spray straw too close that you might touch the wire, if you break the wire element you will need a new MAF.

08-10-2007, 10:04 AM	#1
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Check Engine Light going on - need some help Two things I would change....Platinum plugs, throw them out and put in some autolites, next, go back to advanced auto and tell them they gave you the wrong sensors or harness for them, your right about only having 2. If you use a harness for four sensors, the signal will be reporting four a/f ratios and two of them aren't in so they're seeing no fuel now(hence the ECU reporting a lean condition), get the one for just the two sensors. I would bet lots of money that is your problem.... __________________

09-21-2008, 01:00 PM	#2
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: Check Engine Light going on - need some help up stream sensors measure fuel downstream are there to measure if the cats are cleaning the exhaust fumes.with out the upstream sensors inthe right spot they wont measure fuel __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

09-21-2008, 01:37 PM	#3
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: Check Engine Light going on - need some help Thanks Goodyear, hopefully, she's not still having this problem. lol __________________

03-18-2009, 07:45 AM	#4
jmdesales Registered Member Join Date: Mar 2009 Posts: 2	Re: Check Engine Light going on - need some help I know this post is super old but if you stumbled on here, RE: MAF, Remove MAF, spray the wire element inside the MAF down with brake cleaner, wait 15 min to dry completely, the wire will look and perform good as new. Do not stick a spray straw too close that you might touch the wire, if you break the wire element you will need a new MAF.

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