Welcome to the forum! It sounds like you've got a fun project.

You've got some good considerations ahead of you. 4L80E is a strong and capable transmission and it would be a good choice to use...

Lots of maybes but it's likely something simple.

What head bolt torque value did you use?
Can you see any leakage from under the valve covers?

Hello Phil,

Welcome to the forum. I think you have a good plan. Changing from BUA to ARAP may require some changes to ARAP and to the vehicle. I haven't done this in many years but I believe...

Before Megasquirt existed, I met Bruce Bowling at a get together in Ohio. Bruce is a really sharp guy. We were talking about using tuning software. I told Bruce that the biggest hurdle for folks...

So this is a part of tuning. Three factors affect idle speed. Spark advance, fueling, and air intake. For older ECM's the timing affected idle fastest, fuel next, and IAC last. Many of the OE...

Definitely hose everything off before making any decisions.

Do you know what was installed for a head gasket? Steel shim type or composition?

Some of the cam advice may be left over from the old days. Slower processors and early code didn't play as well with a big cam. Rapid intake pressure spikes would trigger acceleration enrichment...

Not normal at all. Are those leaks from the LH head gasket area? What year is block? You might need to tighten a pipe plug in the LH side of blockbehind the cylinder heafd.

89 G20 will have slow updates. What is an example of the corruption you're seeing?

Hi Dave,

I've found other posts mentioning that Replicated TOS is # of reluctor teeth * rear differential ratio. I am also reading that the 6L80 VSS has 36 teeth. I hope to have time later today...

So this is a tough situation to help with. It's tough b/c as an experienced mechanic I've gotten used to seeing and thinking of problems in ways that help diagnose the what's wrong. Your...

Welcome to the site. Lots of folks here are willing to help if you have specific questions.

Ahh... Yes, the blue ones are different. ;)

The first year trucks were set up a little differently. The relays weren't all installed on the RH side of the cab in a neat row. The fuse holder is...

It really sounds like you love your Jeep and it seems like an extremely capable rig. I have gifted a 95 square eye to my son and it appears we are building a street Jeep. A good Jeep build would be...

Are you working with a square body R/V harness or the K truck harness? R/V had some different connectors and used some different wire colors.

There are tools to help remove the ecu pins. They...

Well, it's not quite that way. The ecm will still deliver injector pulses and spark pulses. The challenge is in how the ecm uses the information. If a V8 engine is spinning at 2000 RPM it's...

Yes, you're approved. My apologies for the extended wait.


As someone responsible for trying to prevent spammers who love posting bad links to illegal medications and other products, I'd like to...

We had one when I left dealer land in ~'97. Although Tech1 kept talking with OBDII, we really only used the Tech2.



How old?

Welcome! Glad we can help. What are you working on?

Hello. Welcome.

Love the sportside truck. They don't build them the same anymore.

Hello,

HPTuners is locked to your VIN and maybe other things as well. You may have to manually enter values from a 4.8 calibration into your pcm. It would help if you can identify your operating...

Even GM wasn't above using an adapter to run TBI. The early Big block TBI trucks used a water heated adapter on a carbureted TBI manifold.

If it runs well, stay with it!

Welcome to the forum!

Best place to start is with free stuff. It can handle an LS swap with no issues.

Those old Z cars are fun. I used to have a 240 back when Scarabs were still new enough...

For reference, 1995 and newer J cars (Cavalier and Sunfire) use an external ecm as pictured above. 1993-1994 J cars used an interior mounted ecm. V6 J cars from 93 and 94 actually used a 1227730.

Hi Tom,

Another potential source for 68HC11 OBDII ecm's is here:
https://www.ebay.com/b/Engine-Computers-for-Daewoo-Nubira/33596/bn_1362181

Daewoo used 1.8L, 2.0L, and 2.2L GM engines and...