CEL is back.....help

[Erics89GT]

91 lx 5 liter 5 spd....tonight while coming back from car show the cel came on.....it came on when im on the throttle over 1500rpms but goes out when i let off....if i run through the gears, then putz around for a few min is doesnt come on...

what do you suspect....o2 sensor, iac, maf, or what....im stumped

[95V6]

Possible vaccume leak? Mine came back on tonight, I disconnected the battery for about 30 seconds and I went off and is still off.

[John4cam]

use a scan tool to pull the code. that will solve everything rather than guessing.

[95V6]

Agreed. Take it to advance auto, they will let you hook it up for free and look up what the code is.

[Mark Aubele]

None of the parts stores have scanners that read pre-OBD II cars. Didn't when I went anyway.

[Erics89GT]

i cant pull a code did tht before n it said system ok its only when im driving it goes on when throttle is down but as the rpms climb is goes on n off when in neutral i rev it the light wont come on

[95V6]

None of the parts stores have scanners that read pre-OBD II cars. Didn't when I went anyway.

They read mine.

[blk93notch]

check the connection at your tb and your air intake hose. it might be sucking air right there and causing it to come on. if not that i would go with a vacuum leak

[Erics89GT]

but when i put the new cobra intake on, i put 1 new o2 sensor on cuz the other was good and i put a new pcv on, but the light never came on and i put over 500 miles on my new setup....im thinkin 02 sensor but it doesnt run like it has a vacuum leak

[cwh19]

They read mine.

Your car is OBDII. Foxes are OBDI. Unfortunately part stores don't pull codes for OBDI cars.

OP do you have a scanner? They are pretty easy to use once you figure out the flashing light thing.

[Erics89GT]

my buddy has one for his 94 n we used tht hence the reason i cant get a code

[95V6]

Your car is OBDII. Foxes are OBDI. Unfortunately part stores don't pull codes for OBDI cars.

OP do you have a scanner? They are pretty easy to use once you figure out the flashing light thing.

Ah, older cars are OBDI.

[SAC81]

Ford ODB-I scanners are only ~$20 last I checked- it's probably worth having around if you're doing a lot of work.

Amazon.com: Equus 3145 Ford Digital Code Reader: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/415HwC1DWAL.@@AMEPARAM@@415HwC1DWAL

[Martin0660]

I have the one shown in the picture above. It's in wifey's convertible since it's the only thing I have left with an EEC

[Erics89GT]

like i said it wont pull a code just sitting ther with a scanner its only when driving

[vitaleffects626]

95v6 is always a great help glad he knows what hes talking bout

[John4cam]

does the light blink on and off when it does come on?

[Erics89GT]

yes and sometimes no it will stay on until i am off the throttle

[Erics89GT]

well i cleaned the iac sensor just now and well tht didnt help....light still comes on...i think its more o2 sensor cuz but i do know its dumping fuel cuz thats all you smell when drivin behind me....and if the MAF is dirty would it cause that

[cwh19]

well i cleaned the iac sensor just now and well tht didnt help....light still comes on...i think its more o2 sensor cuz but i do know its dumping fuel cuz thats all you smell when drivin behind me....and if the MAF is dirty would it cause that

The MAF is the heart of these cars. If its dirty/bad it could cause anything. Taking it off and spraying it with some MAF cleaner is never a bad idea. You still have factory 19lb injectors correct?

[John4cam]

yes and sometimes no it will stay on until i am off the throttle


I'm sure someone will correct me if im wrong but I always thought a blinking cel is a missfire in one or more cylinders. It makes sense too because it only seems to happen when you have the car under load, and not in neutral.

[2000GT]

I'm sure someone will correct me if im wrong but I always thought a blinking cel is a missfire in one or more cylinders. It makes sense too because it only seems to happen when you have the car under load, and not in neutral.

Ageeed. A bad O2 or somenthing like that would cause a steady CEL - not a blinking one.

[yeahloh95]

could be the other 02 sensor that is the most common reason for check eng light on older cars , any chance its a vac line to egr or things in pass fender?

[2000GT]

Troy,
wouldn't that be a steady CEL instead of one that comes and goes depending on the load?

[Erics89GT]

it doesnt missfire cuz rpms climb steady on a hill in 4th

[Erics89GT]

somebody is welcome to call me 724-216-2927

[Erics89GT]

well new TPS, cleaned IAC, and new o2 sensors......still comes on and goes away....doesnt do it as bad but during startup and the first few moments of driving it doesnt do it.....so i am running out of ideas

[mustang50lx]

Most if not all OBD I cars don't set misfire codes. The car should store the code even if the light goes off. Get it scanned.

[John4cam]

Most if not all OBD I cars don't set misfire codes. The car should store the code even if the light goes off. Get it scanned.


Thats what I was wondering.