Doc99SS

iTrader: (2)

Apparently, when the ENG SEN fuse blows, it results is several PCM codes to be set, one being P0102. What would cause this fuse to blow?

SamhainZ28

iTrader: (28)

Check and see if your o2 sensor wires have melted and crossed, it happens a lot with people who have headers.

SSdreamz

iTrader: (3)

exactly what i was going to suggest....that was my problem... gl

Doc99SS

iTrader: (2)

Thankyou for the quick replies.

Doc99SS

iTrader: (2)

I have been under to car not once but twice, checking evry wire near the exhaust headers. I can not find any wire that is/was shorted or melted.

What are my second choices for blowing the ENG SEN fuse?

2001NBMZ28

Usually it is an 02 sensor harness arcing against a LT somewhere, but there are other things on that same circuit - MAF, 02's, skip shift and reverse lockout solenoids.

Doc99SS

iTrader: (2)

I am having a big problem with getting the tranny into reverse (M6). I have no idea where the reverse lockout solenoids are located. Also, I have installed the skip shift elimenator device: I am curious how that could ever go bad in the sense that it is shorted out inside itself.

99huggerorangeZ

iTrader: (2)

short to ground somewhere,good luck

Bad Blue WS6

iTrader: (41)

on my buddies 2000 TA, (no reverse, kept blowing the ENG SEN fuse and getting p0102 and p0803), his was a wire that was rubbing against a heat sheild that caused a lil exposed section on one of his sensor wires. it took a lil bit to find it, but that was the cause.

Doc99SS

iTrader: (2)

Could this be a Knock sensor wire? The knock sensors in the LS2 402 engine are located in the side of the block. I did install thermal shielding on the knock sensor wires as well as the O2 sensor wiring.

Bad Blue WS6: was the offending wire found under the console? Was it a wire having to do with the tranny?

I still have not found the shorted out wire!!!!

99huggerorangeZ

iTrader: (2)

pull up a wiring diagram on the eng sen circuit and check the corresponding grounds first,remove them and clean both the ground surface and eyeloop. if nothing changes after that then it is time to open up some wiring looms.

Doc99SS

iTrader: (2)

Thank you.

SSdreamz

iTrader: (3)

find your problem yet?

Doc99SS

iTrader: (2)

I found two wires which could have been the issue. However, both are part of the wiring for the nitrous system which was not turned on. I insulated both wires, and wrapped them up better.

I also removed the console since I had tranny error codes; I did not find any candidates here.

Also, I went under the car for the 4th or 5th time, and relocated the O2 wiring and the pass-side KR sensor wire. Since I have a LS2 402 stroker, the KR sensors had to be moved to the side of the block. But these wires have been thermally insulated and showed no wear.

I started the engine up last nite, after replacing the 20 amp ENG SEN fuse. I let the engine run for two minutes; it seemed to run very good. After shutdown, I checked the ENG SEN fuse, it was still good.

I should get 95/92 FAST system tomorrow. I will install this Saturday. When doing this, I will look for wiring issues behind the intake.

Doc99SS

iTrader: (2)

This is very fustrating!!!!!!!!!
I went out for a 10 minute drive, running AutoTap (yes, I am a dynosaur). About 4 minutes into this drive, the MAF stop reporting a frequency. That is when I know the ENG SEN fuse has blown. Therefore, I have not located my short.

Does anyone have any help for me? I am at my wits end here!!!!!!!!

jimmyblue

iTrader: (11)

If you are to the point of desperation, you might try cutting
(or de-pinning at the PCM connector, if you have or can fake a
pin removal tool) the O2 sensor heater power feeds, high side.
Maybe start with rears, if fuse blows again kill the fronts, if
that doesn't stop it you're down to the on-motor sensors. This
ought to get it narrowed down, then you would have to find the
real flaw and fix it plus the cuts / pulled pins. But soldering on
the heater feed won't hurt anything other than cosmetics.

Have you tried simply pulling the sensors at their closest connector
to the PCM, one by one (I assume you have a pack o' fuses handy)?

eallanboggs

iTrader: (1)

You need to look at a schematic and find every device on that circuit. You can then plug them back in one at a time and drive the car to see if the fuse blows. If it doesn't blow plug another device and repeat the test until the fuse blows. Once it blows you concentrate on that circuit alone using the schematic. Helm would help at that point.

StreetSilverado

iTrader: (17)

I know your pain, it's very frustrating. Lucky for me it was just my 02's shorting it out . But yes like everyone else said it's something a ground touching or something.

DJstylze

I have had this same problem - not to thread hijack. But why make a new post? ;0P
Anyways - 98z28 - no headers, nos, turbo, or any of that.
I have sat under my car to no avail - no burned wires, just the same 2 codes 0803 and 0102. The wire looms are in great condition - I figured if the O2 sensor failed it would run like crap like it did before. Plus it throws a separate code.

What is your opinion on installing a whole new harness?

TransAm Bandit

im stocking with the same problem checked everything and find the reverse sensor was the place which blows the Fuse fix another one and the car runs fine after hard accelerate the fuse blown and everything came to the crap sitaution again (