do your check engine lights go on and off?
10-26-2006, 04:51 PM
#21
Super Moderator
Join Date: Jan 2004
Location: IL
Posts: 10,637
RE: do your check engine lights go on and off?
ORIGINAL: vristang
I don't like to call people out....
but that is quite possibly the worst bit of EFI advice I have ever heard.
1 - You have NO idea why the computer is triggering the CEL. Just because your CEL has triggered for O2's, does not mean that all CEL triggers are for O2's.
2 - Because you don't know what is causing the CEL to trigger, how can you say it doesn't affect performance?
If the CEL is being triggered for MAF, ECT, ACT, BAP, etc. then it WILL affect performance.
3 - Bad O2's will DESTROY your fuel economy. It is worth fixing bad O2's.
There is a book called Ford Fuel Injection & Electronic Engine Control 1988-1993 written by Probst.
This book is an excellent read. After reading it, you will have a very good understanding of what the computer uses all of the various sensors for.
The book is well written, and easily understood. This is not an engineering text; it was written for the average enthusiast.
Again, my intention is not to make anyone look 'stupid'
But there is enough confusion out there already about how EFI works. The above comments will only add to that confusion.
reduceallpain -
You need to pull your Engine Diagnostic Codes to see what the computer thinks is going on.
If you don't have a computer scanner, check out the link in my sig.
Once you get your codes pulled, come back and post them up.
I am sure someone can help you sort things out.
Good Luck,
jason
ORIGINAL: Stanpower
Its usually the o2 sensors are acting up alittle bit it happens with mine every once it a while.If the light stays on all the time then you need to get it check otherwise dont worrie about it .That dosen't affect performance...........
Its usually the o2 sensors are acting up alittle bit it happens with mine every once it a while.If the light stays on all the time then you need to get it check otherwise dont worrie about it .That dosen't affect performance...........
but that is quite possibly the worst bit of EFI advice I have ever heard.
1 - You have NO idea why the computer is triggering the CEL. Just because your CEL has triggered for O2's, does not mean that all CEL triggers are for O2's.
2 - Because you don't know what is causing the CEL to trigger, how can you say it doesn't affect performance?
If the CEL is being triggered for MAF, ECT, ACT, BAP, etc. then it WILL affect performance.
3 - Bad O2's will DESTROY your fuel economy. It is worth fixing bad O2's.
There is a book called Ford Fuel Injection & Electronic Engine Control 1988-1993 written by Probst.
This book is an excellent read. After reading it, you will have a very good understanding of what the computer uses all of the various sensors for.
The book is well written, and easily understood. This is not an engineering text; it was written for the average enthusiast.
Again, my intention is not to make anyone look 'stupid'
But there is enough confusion out there already about how EFI works. The above comments will only add to that confusion.
reduceallpain -
You need to pull your Engine Diagnostic Codes to see what the computer thinks is going on.
If you don't have a computer scanner, check out the link in my sig.
Once you get your codes pulled, come back and post them up.
I am sure someone can help you sort things out.
Good Luck,
jason
It's very likely it's the 02 sensor since they all did that.
10-27-2006, 12:10 AM
#25
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
RE: do your check engine lights go on and off?
Those of you old enough to remember when Fox's were new, this was a very common problem. Every now and then the CEL would come on for a second and then go off. I'm with you on the pulling the codes, but if the light isn't on it doesn't store the code. So now what?
10-27-2006, 12:30 AM
#26
4th Gear Member
Join Date: Feb 2006
Location: Seattle, WA
Posts: 1,375
RE: do your check engine lights go on and off?
ORIGINAL: reduceallpain
went to autozone.. told me there computer couldnt check my car..only works on 96 and up
went to autozone.. told me there computer couldnt check my car..only works on 96 and up
I have a link in my sig that should get you through the process of pulling codes without a scanner.
Hope you get it sorted out.
Let us know what you find.
jason
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