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96 OBDII Vs 95 OBDI

pacificdrumma

pacificdrumma

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Found a nice 95 pickup for sale close to me, 5 speed stick with low low miles. Currently I have a 96 obd2 truck and want to know if there are any advantages or disadvantages to getting an obd1 truck.
 
Chips are easy to change for tunes in the 1995. Paper clip code reading.

The 1995 AC controls were junk and a 1 year only design. Hummer all but recalled them and used something else for 1995's. Is the compressor is on the driver's side for your 96? The 1995 compressor design needs frequent service.
 
Depends on what you want.

If it's just a runner, no real difference.

For modifications it's pretty much a wash either way.

OBDI needs software to initiate a tdco relearn OBDII does not.

OBDII needs scanner software to read and clear codes, OBDI does not.

Reflash is a relash whether you do it directly into the PCM in OBDII or on to a chip and pop it in to the PCM on OBDI.

OBDI is a bit cheaper to get into tuning than OBDII, but I find OBDII is simpler once you get past the initial buy in price.

If you're buying chips or reflashed PCMs there really not much difference at your end, maybe a bit on price depending on where you buy. Some would say it's less likely for you to have an ESD event with OBDII as you swap in the whole PCM instead of opening the case and swapping chips. I've never had a problem either way and I wouldn't worry about it if you follow even the more basic of electrostatic bonding proceedures while doing your thing.

Both have optical sensors and pump mounted drivers (PMD) to die on you. OBDII trucks have a better way of powering the lift pump (through the PCM and the oil pressure switch vice just the oil pressure switch) and don't have an optical sensor filter harness to cause you troubles. Most OBDI trucks seem to work fine without the sensor filter harness anyways.

Both a susceptible to poor grounding over time as corrosion creeps in.

OBDI you can wire in a manual switch for TCC lockup control, OBDII has to be done through software changes (it uses a PWM signal to lockup the converter, OBDI is just 12V IIRC).

All the rest of the common problems are there on both trucks (IE: lift pumps, air intrusion frustrations, electrical gremlins, etc).

So, I'd say it's a wash as to which one is better or worse.

I prefer OBDII, but either is just fine.

5 Speed is nice for basic, solid use and minimizes the amount of things with wires sticking out of it to go wrong. Except for clutch and throwout bearings, the 5 speed should essentially last forever. Auto is nice if there's lots of stop and go traffic in your daily use.

:)
 
I found a 95 K3500 SRW QCLB 5 speed with 64000 miles and I want to take a look at it. I will either be building my truck or that one if I wind up with it (plans for building can be found in my other thread). Intake, exhaust, chip, injectors, turbo, gauges, LP. Just trying to learn about the 95
 
WarWagon said:
Chips are easy to change for tunes in the 1995. Paper clip code reading.

The 1995 AC controls were junk and a 1 year only design. Hummer all but recalled them and used something else for 1995's. Is the compressor is on the driver's side for your 96? The 1995 compressor design needs frequent service.
Click to expand...

Isn't the compressor the same design that had been used for many years prior? Please explain.
 
SnowDrift said:
Isn't the compressor the same design that had been used for many years prior? Please explain.
Click to expand...
1995 uses the GM R4 compressor and is a good compressor, but the problem is that GM hasn't built any for a long time now and the cores are getting about shot. So all you have are remans built using worn out cores and the failure rates have proven pretty high in them with the case o-ring where the steel housing and aluminum pump portion slide together. Also R-134A leaks out easier than R-12 did, and the R4 doesn't seal up the best with R-134A.
 
THEFERMANATOR said:
1995 uses the GM R4 compressor and is a good compressor, but the problem is that GM hasn't built any for a long time now and the cores are getting about shot. So all you have are remans built using worn out cores and the failure rates have proven pretty high in them with the case o-ring where the steel housing and aluminum pump portion slide together. Also R-134A leaks out easier than R-12 did, and the R4 doesn't seal up the best with R-134A.
Click to expand...

good info. I had no idea. When I replaced mine about 10 years ago, I bought a new one. The good thing is that it's not been touched since then. Hopefully someone will have a handle on this if I ever need to replace mine.
 
I personally like the obd-1 trucks, and i like the newer interior, so for me the 95 is a win win. If it sold that quick must have been a good price.
 
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