383ls1blazer

iTrader: (8)

alright guys ive searched for hours and have not found an exact conclusive answer

i have a 98 motor with 98 sensors i need to use a 99 harness and computer so i can do a 3 bar tune for my FI application

i know a 98 won't work with a 99 pcm thats not the question the question is what needs to be changed as far as sensors or whatever on the 98 engine to have a 99 harness and pcm work. my intution would say that nothing really has to be changed but people keep saying all different things

also this is going to be a stand alone harnes i don't care about the guage cluster i gotta use all aftermarket guages anyways and guages are overrated anyways lol j/k

DrkPhx

iTrader: (15)

Here is what I know needs to be changed:

1) Oil Pressure sending unit (98 has 3-prong connector, 99-up 2)
2) Engine coolant temp Sensor (98 has 3-prong, 99-up 2)
3) You will have to use a 99-up fuel pump assembly.

But I would contact Speartech. They are experts in harness and wiring conversions. I would also check in the conversion and hybrid section here.

383ls1blazer

iTrader: (8)

so are these the only sensors that would have to be switched? i heard rumors that the cam and knock snesors are different and that the 98 has a ect sensor and the 99 doesn't

AzzHauler

iTrader: (3)

Knock sensors were chanded at some point, but I'm not sure if the new one replaced the original 98 part number or not. You can use the newer ones on 98s, so you should be able to use the 98 sensor with a later harness, however the newer sensor is obviously better than the originals. And 98's had a lot of false knock issues.

383ls1blazer

iTrader: (8)

thanks for the responses guys. how about the cam sensor one guy said it was different ut ive seen some for sale and they say they fit all years 98-02

hpmotorsports

iTrader: (5)

cam sensor is the same

zapp168

iTrader: (7)

When you say 99+ fuel pump assembly, do you mean rewire the fuel pump? or replace the entire unit?

383ls1blazer

iTrader: (8)

that is the oil pressure sensor right? if i get aftermarket guages they will come with those snesors right the oil pressure sensor and a water temp guage will come with that sensor right?

Honda Hunter

iTrader: (8)

Doesnt seem like a hard/expensive swap at all. Seems as though most discourage it for some odd reason. Good info here.

DrkPhx

iTrader: (15)

Because of the difference in fuel pump assemblies between 98 and 99-up, the wiring is also different. So there is splicing required. However, you should still contact Speartech to get a 100% straight answer on what is needed for your specific application.

DrkPhx

iTrader: (15)

Yes, it is the oil pressure sensor or oil pressure sending unit. They key is finding an application specific wiring harness that will allow you to use the OEM sensors and connect to whatever gauges you want. The S-10/LS1 conversion is very popular, so there has to be a harness that can used for your application. Once again, I would contact Speartech (sponsor here >>) for guidance.

383ls1blazer

iTrader: (8)

this is definetly not a typical s10 ls1 conversion its a turbo motor that i plan on running up to 22-25 psi so i have to have many additional aftermarket guages and other eltronic components.
i will probably be to get an aftermarket oil psi guage does that come with its own sensor. i was under the impression that the aftermarket guages and such come with their own sensors. (forgive me i just started researching out all the eletronic stuff and im in a bit of a rush lol so please forgive any stupid ?'s of mine lol)

so are these (the oil psi sensor, water temp sensor, ...) the only ones that are different i read something about an ect sensor?

and as far as the fuel im running parralel bosch 420L's each on a -8an line so no need for the 99+ fuel assembly ))

Speartech

iTrader: (14)

Yes, the oil pressure sending unit and the coolant temp sensor are the only things different if you are using a 99-up harness on a 98 engine. The ect is the same sensor (Engine Coolant Temp).

The 98 had a 2 terminal oil press. sending unit (the newer ones are 1 terminal).
The 98 had a 3 terminal coolant temp sensor (the newer ones are 2 terminal).

Change those two and evreything on a newer F-body harness will plug in.

01 and 02 F-body harnesses won't have a plug for EGR, but most people get rid of it anyway.

WicketMike

iTrader: (13)

HP Tuners might let you still use your 98 stuff for a 3 bar.

Im using HP tuners with a 2 bar

Honda Hunter

iTrader: (8)

So the fuel pump isnt a issue as said before?

Speartech

iTrader: (14)

It would be an issue if you were trying to do this on a 98 F-body, but for a stand alone engine swap like what he (original poster) is talking about it's not an issue.

tunedportcj5

iTrader: (18)

The fuel pump/sending unit/gauge was not an issue with my swap...

jfman

iTrader: (6)

What about the injectors ? I thought you had to swap those also....