Something happened... not sure what... need advice.

[AlaskaBound]

Originally Posted by Disco Mike

Ouch!!!

yeah, just an "estimate". I took my car back... attached the grounds and PRESTO! Back to normal. Other than running almost 100% better, it's still acting wierd on occasion... I'll step on the gas and.................nothing... then 3-5 seconds later it will kick in. Any thoughts? Clogged cat? Fuel issue?

[AlaskaBound]

Bump...

Still having acceleration issues... Fuel pump?

[Rovin4life]

Are the grounds actually fixed or just attached/


And no I doubt the acceleration problem is fuel issue.

Its possible the MAF sensor wiring could be messed up or that missing oring could be leeing in a little air causing issues.

[AlaskaBound]

Originally Posted by Rovin4life

Are the grounds actually fixed or just attached/

And no I doubt the acceleration problem is fuel issue.

Its possible the MAF sensor wiring could be messed up or that missing oring could be leeing in a little air causing issues.

"Actually fixed or just attached" What do you mean by that exactly?

The grounds are in... the one to the ALT bracket from the negative battery cable is on... there's one on the driver's side from firewall to exhaust manifold bolt and a brand new one from passenger side firewall to exhaust manifold bolt.

I can take out the MAF sensor and look it over, but it's brand new.... I put in the O-ring also... And I tightened the throttle cable a bit too... it was sort of loose... thought that would help, but it didn't.

All 4 O2 sensors are new too... New fuel injectors, plugs, wires, camshaft sensor, etc.

I'm getting a REALLY pungent gas smell out of the exhaust. It's really snowing hard today and I let my car warm up for a bit and there was a brown/black stain in the snow coming from the exhaust... Exhaust feels weak when I put my hand under it... Car Idling at times between 500-600RPM... If I really punched it, the RPM's won't jump up as high as normal... won't really get above 2500 RPM...

Car still hesitating on and off and really, not performing like it should... ??? Could it be a vacuum issue? I'm stumped....

[Disco Mike]

So after you repaired or replaced the grounds have you cleared the codes to see what other issues are still there?
Mike

[AlaskaBound]

Originally Posted by Disco Mike

So after you repaired or replaced the grounds have you cleared the codes to see what other issues are still there?
Mike

No I haven't cleared the codes yet, but I'm going to do that today... I'd like to reset the adaptive values to my ECU but was told that simply disconnecting my battery will not do it on my 99DII and that this is different than just clearing my codes... I need a Rovacom or a lot of patience because over time it will set itself to new values.

Are the symptoms my rig having characteristic of anything in particular? Fuel filter? Crimped fuel line? MAF? O2 Sensors? etc.

Someone also told me that if I was having "lean" issues, to reset the ECU and disconnect my MAF and see what error codes come up. When the MAF is un-plugged, the idle should be up and down between 800 to 1200 rpm and have check engine lights on, and in most cases with the MAF unplugged, the engine should overfuel a bit, so this might be able to get rid of the rest of the error codes if those codes are caused by lean problems.

Does this sound right?

It's a pretty interesting post that covers a lot of unchartered 4.6 conversion stuff and trying to trouble shoot this issue. If anyone's interested in this conversion in the future, you should read it over...

http://www.discoweb.org/forums/showt...eferrerid=2871

[AlaskaBound]

Cleared codes and SES light came on... Same codes still there.... even after grounds installed... now fuel temp sensor can be added to the list too...

>???????

[Rovin4life]

Its possible you burned something out.

Give me some time on this. Its possible you burned out more then one wire but which one I am not sure.

[AlaskaBound]

Originally Posted by Rovin4life

Its possible you burned something out.

Give me some time on this. Its possible you burned out more then one wire but which one I am not sure.

Does one or maybe two fuses run all these sensors... maybe the ground issue blew out the fuse????????????????

Does the large wiring harness that runs above the plenum on the back of the firewall contain all the wires for these components?

Thanks for your help...

[Roverhound]

Do you have an ecu you can try?
Also as far as grounds go, the ecu doesn't look a path to earth, the flow of current does this itself. It found the best thing to ground to which was the e-brake cable.
The D2 does not have a fuel filter. It has a "sock" that fits over the fuel pump intake.

[AlaskaBound]

Originally Posted by Roverhound

Do you have an ecu you can try?
Also as far as grounds go, the ecu doesn't look a path to earth, the flow of current does this itself. It found the best thing to ground to which was the e-brake cable.
The D2 does not have a fuel filter. It has a "sock" that fits over the fuel pump intake.

I don't have a 4.6 ECU I can try... I wish I did... I can probably source one on Ebay or something... but I'm looking for a solution for now...

So, if you can't replace the "sock" then do you just have to replace the whole pump? Wonderful

[Rovin4life]

Ok, didnt forget about you I just had to do lots of research on GTR.

anyway after further review the main issue I see is Fuse Number two. It supplies all the power to the sensors involved.

But those recieving power recieve it on four different power wires coming off of the fuse box.

Also Check Connector 570 and connector end 573. Those supply the power to the sensors.

C573 wire numbers 2,3 NK
C570 wire numbers 5, 1 Nk


Purple/pink

The fuse is fifteen amps.

Check it and get back to me

[AlaskaBound]

Originally Posted by Rovin4life

Check it and get back to me

Checked Fuse #2... looks OK... where can I check the 4 different wires and connectors 570 and 573? Don't really know what I'm looking for...

Thanks... I'm going to double and triple check my grounds to make sure they're on well... but I'm still at a loss as to what's going on... Like I said before, the car was running perfect until one day it started acting funny... I'm still under 1,000 miles on the new engine...

I appreciate your help...

[AlaskaBound]

CORRECTION... I'm an idiot... I was checking the wrong fuse because the manual lists the fuses in opposite order... I thought fuse 2 was the second from the top but it's the second from the bottom...

At any rate... the fuse was blown... I replaced it, cleared the codes and drove it around... the SES light popped back up and I checked the new fuse I just put in... BLOWN OUT again...

Is it a ground issue that's causing my fuse to blow?