Problem solved: Wiring harness was bad, now cats are bad

[SeanMc]

Ok, I replaced the wiring harness, and the car started up better than it's ever started before! Now I have a tapping sound coming from my front cam **** valve cover (confirmed with stethoscope)...cam chain tensioner right? Yeah, hopefully. But, can a bad tensioner cause a misfire?

 

[NiNeTy Fo SHO]

A lean condition on only 1 bank would mean to me that either:

1) The O2 sensor on that bank is bad.

2) Somehow, only that bank of the intake is leaking causing extra un-metered air to get in.

I guess it could also be an exhaust leak before the O2's...dunno what that would give.

 

[SeanMc]

A lean condition on only 1 bank would mean to me that either:

1) The O2 sensor on that bank is bad.

2 o2s being bad? I don't think so.

2) Somehow, only that bank of the intake is leaking causing extra un-metered air to get in.

I've re-set the intake, made sure everything is tight, tightened the silicone couplers down, sprayed the intake with carb cleaner and the idle never changed.

I guess it could also be an exhaust leak before the O2's...dunno what that would give.

Hmm...bad gasket? I can't hear any ticks, but, how would you check for a leak?

 

[SeanMc]

I forgot to mention, cylinder balance test showed a 9.

 

[jedhead]

Sean, your car runs pig rich. Maybe your O2 sensors are getting carbon coated from the rich mixture.

Bob

 

[SeanMc]

Sean, your car runs pig rich. Maybe your O2 sensors are getting carbon coated from the rich mixture.

Bob

But why is it just that one bank? Brian brought some injectors that he was going to let me use, but they were contour injectors.

Brian is FTL

 

[Phoenix]

Is it possible for you to swap with 3 good injectors (on that side) and see what happens.

My other idea is the MAF , but why only one bank?

 

[SeanMc]

Is it possible for you to swap with 3 good injectors (on that side) and see what happens.

My other idea is the MAF , but why only one bank?

I need to buy a set. I think I'll buy them off of 1993MTXSHO. Just gotta get some monies in the paypal first.

 

[jedhead]

Brian should have some 3.2 injectors unless he used/sold them already.

Bob

 

[1slickRED89]

I would say you need a break-out-box so you can see what the sensor is doing. might be a wiring harness issue.

thats why I like OBD2 cars, just plug in the scanner on any car and you can read sensor outputs, makes life so easy.

 

[SeanMc]

Brian should have some 3.2 injectors unless he used/sold them already.

Bob

He brought Contour injectors Said that's all he had.

I would say you need a break-out-box so you can see what the sensor is doing. might be a wiring harness issue.

thats why I like OBD2 cars, just plug in the scanner on any car and you can read sensor outputs, makes life so easy.

Ooook, how do I do this?

 

[1slickRED89]

a break out box is a panel that you plug in-line with the cars EEC. so if you are worried about the o2 sensor output, you put a voltmeter on the pin for the o2 output and see whats its doing while you (or someone else) drives. I have an old one that was going to be thrown away and it has saved me quite a bit of "sensor chasing". the eec-iv (60 pin) ones are pretty cheap if you look around.

 

[Redskull]

if your MAF is dirty (recent K/N air filter re-oiling?), you can get lean. But just one bank? Maybe the one that's *not* reading lean is the bad one

 

[SeanMc]

I found my leak. It's right under the rear butterfly canister. The gasket is actually broken.

 

[SeanMc]

Replaced the gasket, reset the computer, still getting the lean code. I can still hear a pshshshshshsh, and it sounds like it's coming from one of the hoses that connect to the vacuum solenoid on the rear butterflies. Would that cause a lean code?

 

[jedhead]

Any air getting into the engine without going past the MAF can cause a lean condition.

Bob

 

[SeanMc]

Replaced the front o2 (I was chasing the wrong bank. Found out 'left' is the 'front' bank). I drove 220 miles today. Used just under than half a tank. JustInsidetheG8s can vouch for this, he was with me all day. There were some accellerations that he was like "woah". I'm beginning to think this is a false code? I'll do a full reset again tonight, and let you know my findings. Also heard someone suggest Ford O2s over Bosch. *edit* while driving, the car never got over the R when going uphill with the a/c on *edit*

 

[SASHO91]

Its one of two things...

Another vacuum leak.
OR
A problem in the wiring harness.

I personally think you have another vac leak somewhere.

 

[SeanMc]

Its one of two things...

Another vacuum leak.
OR
A problem in the wiring harness.

I personally think you have another vac leak somewhere.

Tightened everything down, no whistles, did the carb cleaner thing, no change in idle anywhere on the intake, checked the hoses, all fine, etc, etc, etc. Where could it be?

 

[SASHO91]

Not sure...
FWIW, the carb cleaner method does not always work. You will probably have to pull the intake completly apart and re-seal it, thats what I had to do when I couldn't find mine.

But before you do that.. I suppose you could check the wiring harness for the O2 sensor by test for continuity on each wire (unplug EEC-red lead @pin black lead @ O2 connector).