Just wondering if a harness out of a 00-02 would work in a 97 2.4

97-98 ENGINE harness are the same. 99-02 are the same.



PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

Oh really. What's different between the 98-99. I bought my engine from a u-pick over a year ago and dono what exact year it is. Is there anyway to tell?

Casting number on cylinder head.

96-98 Head Casting number is 683-18.

99-02 Head casting number is 779.



PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

Cool thanks for the info. Very helpful. What's different in the harness for the two engines? Sensor locations? Or what makes them not compatible.

O2 sensors, knock sensors, injecoters, EGR, and I'm sure I forgot some.




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

Cool thanks for the info. Very helpful. What's different in the harness for the two engines? Sensor locations? Or what makes them not compatible.

Sorry double post thanks for info.

I was under the impression 99 had to use its own harness and you are unable to use the 2000+ harness. as different connectors and such, as I am having that problem now need to replace my 99 harness asap

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

00-02 harness is VERY close. The front 02 sensor is 1 wire in 99 and 2 wire in 00-02. Off the top of my head. I think that is the only difference with the engine harness. Ideally 99s would need 99s for no mods to the harness.

Small Starter 99-02
Large Starter 96-98
Alternator are 99-02
High Impedance Injectors 99-02
Low Impedance Injectors 96-98
1 Wire Front O2 sensor 96-99
2 Wire Front O2 sensor 00-02
Knock sensor 96-98
Knock Sensor are the same 99-02
99-02 No EGR
96-98 EGR

Headlight harness is 99 Only.




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

so your saying need to splice the 2000 harness in order to get the 02 to work either then that should work? lets not forget ECM modual different locations and style, also the fact, of being different styling ecu, as I believe the pins are different.

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

I have the pin-out someone on my home computer for a 99 and 00, I'll look to see if I can find them.

You can run a 00-02 tune on the 99 PCM and wiring, you do however lose some gauge functions.

This post will help. 99 to 00 ecu.



Edited 1 time(s). Last edited Wednesday, May 25, 2011 12:01 PM

PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

yes I want to keep my cluster as its my favorite styling, and I don't want to do another tune as noone in this stupid city does tuning and noone in the tuner scene up here has HP tuners. but I believe you should be able to rewire the 99 ecm to use the 2000 wiring with a little bit of splicing. a stock tune would suck for me lol, wouldn't run right. and I believe will be forced to remove my dash and redo the wiring if ran bcm. but if the wires are the same for the plug in engine compartment that connects the interior and engine harnesses together should be workable. thats where Im at currently and then I would just move my fuse box under the centre console as Im running with the 99 sunflower centre. then fuse the cigarette light/12v to the engine fuse box. as my battery already in the trunk

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

Want to share your HPTuner file?




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

Ill see if the guys still have it, she was tuned about 4-6 years ago lol, shes getting retune after the new toys go on, but tuning Id have to tow to alberta to get done, not a fun task

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

99 harness wont work it has a UART data line and a serial data line the 00+ have 2 serial datas and no UART

also the ABS connection isn't even close the wiring harness has too many differences to swap




JBO since July 30, 2001

Well, I'm sure Matt knows a hell of a lot more than I do.




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

hard to tell mike if that was sarcasm or not????

the fuel level & VSS in 99 goes to the cluster in 00 it goes to the PCM then through the serial data to the cluster

when you do say a 3400/3800 swap you have to piggy back or do autometer or do 00+ cluster swap because the 99 cluster doesn't read PCMs that don't have the UART data line when the swap is don't you have every idiot light on and loose water temp and tach you only have speed and fuel

i ran autometer for 2 years and this past fall wired my car for the 00+ cluster now i have stock gauges and a pod with my wideband and boost gauge.

99 is basicly the middle child of the family its left all alone the older bother (98) and the youger bother (00) don't wanna play with him because hes too different 95 is also the same as 99 way differnet then 94 and has minor differentces from 96+




JBO since July 30, 2001

thats what I thought, I ran through everything and I see that only 99 will work, but thats the dumbest thing I ever heard, one year all by itsself, and I cant find a harness anywhere

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

Matt, I was not being sarcastic.




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

thanks mike internet is hard to tell sometimes i think thats why people take things the wrong way

a 99 harness is accually closer to a 98 then an 00 the only difference in hookup is D3 on the 98 is empty on the 99 that is for the evap canaster in the rear of the car

98 its in the front passenger wheel well behind the headlight.

then you have EGR and a few data related things



JBO since July 30, 2001