Builds 1984 Pickup Rebuild

[gnob]

if you have egr, check that out. make sure it's plumbed properly

 

[Mudder]

if you have egr, check that out. make sure it's plumbed properly

I removed the EGR and EGR tube when I went to the new mini header. I’ve also removed all the drive belts and test drove it and it’s still present.

 

[gnob]

do you have a scanner so you can see data during the issue ?

 

[Mudder]

I do. I wonder if watching the rear O2 sensor would show anything. It sounds like it’s before it. I also wonder if it’s why I have a random dead throttle when taking off sometimes.

 

[gnob]

I do. I wonder if watching the rear O2 sensor would show anything. It sounds like it’s before it. I also wonder if it’s why I have a random dead throttle when taking off sometimes.

dead throttle says tps or maf to me.
without digging back, do you have the drop in maf or module piece?

 

[Mudder]

dead throttle says tps or maf to me.
without digging back, do you have the drop in maf or module piece?

It’s a drop in MAF. I’ve tried a different Toyota TPS and the same issue. It’s only in first gear when it drops off. It acts like it stalls and then takes off

 

[gnob]

also possible iac issue

 

[Mudder]

I scheduled a time to other a mechanic who taught me how to work on vehicles to look at it for the ticking. I’ve spent days hunting and welding leaks up so I need some fresh eyes and ears on it I decided.

Has anyone ran the AA T case housing? I’m wondering if it would be worth it and to just convert my forward shift to a top shift for the front case and use the AA housing in the rear. this truck will rarely see rocks so if a stock Toyota case is fine I’ll keep looking for one instead.

TOYOTA P/U REDUCTION HOUSING

Heavy Duty Toyota Truck gear driven transfer case gear reduction housing.

advanceadapters.com

 

[aztoyman]

I have not but I probably would. I thought about getting one when they have been on sale just to have a spare. I have been running their TX2 adapter for a long time. Not as pretty as a Marlin or TG but it works.

 

[Mudder]

I have not but I probably would. I thought about getting one when they have been on sale just to have a spare. I have been running their TX2 adapter for a long time. Not as pretty as a Marlin or TG but it works.

It looks solid and AA has been around for a long time. I would’ve gone with their adapter but I bought my MC08 back in 2016 and it’s been sitting in the shelf since then waiting for me to use it

 

[Mudder]

dead throttle says tps or maf to me.
without digging back, do you have the drop in maf or module piece?

I thought I had a drop in maf but now I’m questing it. When I look up the part number it shows the entire assembly. I have the 5 wire MAF and not the 3 wire one. Do you think a later model on will be interchangeable? I’ve been looking for threads on it and keep finding for the 3.4.

 

[gnob]

afaik, yes.
a friend swaps them in 3.4s all the time.
the connection needs to be repinned.

3.4 swapped in 99

 

[Mudder]

I cleaned the MAF and it seemed to help. I’ll keep an eye on it and if needed I’ll order a new one from Toyota. I also picked up another t case. It’s a forward shift but it was only $150 for it. I’ll convert it and the other forward shift I have to top shifts and build my duals.

I was talking with a mechanic friend about it and he suggested I use chassis ears to help find the exhaust leak I’ve been fighting. It only happens under load on a road. With the chassis ears it took less than 30 minutes to find it. I hooked up all 6 leads around the exhaust and had a control one in the middle on the transmission crossmember. In the second photo there’s a lead with a blue band on it, when listening to that channel it’s the loudest. It’s definitely coming from where the manifold connects to the down pipe on that side.

At this point I’m going to remove the clamp that holds it to the transmission to see if that’s applying a weird load under torque allowing it to happen. I’ll also try to tighten it more.

 

[gnob]

I cleaned the MAF and it seemed to help. I’ll keep an eye on it and if needed I’ll order a new one from Toyota. I also picked up another t case. It’s a forward shift but it was only $150 for it. I’ll convert it and the other forward shift I have to top shifts and build my duals.

I was talking with a mechanic friend about it and he suggested I use chassis ears to help find the exhaust leak I’ve been fighting. It only happens under load on a road. With the chassis ears it took less than 30 minutes to find it. I hooked up all 6 leads around the exhaust and had a control one in the middle on the transmission crossmember. In the second photo there’s a lead with a blue band on it, when listening to that channel it’s the loudest. It’s definitely coming from where the manifold connects to the down pipe on that side.

At this point I’m going to remove the clamp that holds it to the transmission to see if that’s applying a weird load under torque allowing it to happen. I’ll also try to tighten it more.
View attachment 3929286View attachment 3929291

never heard of that before. cool deal.

 

[Mudder]

Well with the constant 90s to 100s we’ve been getting I’ve noticed that my fan clutch doesn’t disengage. I know years back I changed the fluid for thicker fluid so I’m sure that’s it but it’s still betting high up on the temperature gauge when pulling long steep hills. I took it up a local hill that gains about 2,000 feet in 6 miles and has a few switchbacks and it got close to overheating. It also was slow.

I had to downshift to 3rd gear, hit 5k rpms which was 60 mph then I could go back to 4th until the next switchback. I was never able to hit higher than 60 and I couldn’t accelerate in 4th gear either. My hope is to make it to cruise Moab next year and with that in mind I’m looking at either a supercharger or a turbo setup otherwise it’s getting trailered. The supercharger kit from LCE is a pretty penny (4k) and I think I could do a homemade turbo kit for half that.

For cooling, I’m planning on doing what @liveoak did and use a 2wd 3.0 radiator and the bigger 3rz fan to help with the overheating. I wish I would’ve had my OBD setup to see what the actual temp the computer was seeing.

One thing I am happy about is it’s getting between 14-16 mph with daily driving and mountain driving. I can’t complain with the 35’s and 5.29’s.

Going through old photos I found one of a buddy’s 84 in high school next to mine when it was on 31s

Same place 10 years later

 

[Mudder]

New radiator, fan shroud, fan clutch and fan installed. I copied @liveoak and use a Liland 2 row 3.0 radiator, a 2rz fan shroud modified to fit on the 3.0 radiator. I used a 3rz fan and fan clutch and some 1/2 thick foam to seal the gaps I had. My fan blade are pretty close so I’m hoping that doesn’t cause me issues off road. I have about 1/8th of an inch of clearance on the drivers side.

Tomorrow’s high is almost 100 so I’m planning on hitting the same 6% grade and seeing how it does this time.

Comparison of the 3rz vs the 22re fans and clutches.