jondee86 wrote:Getting a bit off topic so I added an edit to this post...
viewtopic.php?f=9&t=12011

Cheers... jondee86

Nice one! Clarity incarnate.

Sorry to burst your bubble, but that's not the way it works on a 4AGE. I actually thought it was that way too, until someone (jondee) posted otherwise. If the crankcase were a positive vent, manifold vacuum, without an operational valve the engine would not idle. Every time the throttle would close ...

After reading that bit I realize how long I've been away from the whole thing, I can't even get the terms right, I've been calling it 'HP' when I meant 'EP'. I have recommended the use of phosphates in machinery, engines and gearboxes. It's been 20 years since I went that route.

Phosphates and sulfur have been added to oil for quite some time for their HP qualities, their abilities to adhere to metal surfaces and reduce friction. I have read some studies on the subject, NASA did a decent test on the subject. I used TSP in my VW engines. Only thing that made it seem like it ...

Great read! Thanks for this, it's an important issue any gearhead should pay attention to. Can this be made a sticky so it doesn't get lost in the pile of posts? If you want another interesting subject try lubrication chemistry or HP additives. See how hot it gets when you talk about adding TSP to y...

Too bad there isn't a flow metering device to measure the flow rate instead of, or in addition to, pressure. In the past I've built my 1/4 mile engines with looser tolerances and high volume pumps (VW days). Increased clearances and notched rod thrust surfaces to allow oil to flow. No real way to me...

factory oil pump & 8000rpm redline can't be compared to an elaborate dry sump & 9500+? rpm Totally different operating parameters. Wouldn't be surprised if the restrictor was 'overwelmed' in the latter Apples and oranges really. For a factory oil pump, high RPM is probably the worst case sc...

I've had similar issues with a 20R in the past, oil pooling in the valve cover that is, and it produced a nasty oil cloud when it happened. For that problem I found refreshing the rocker assembly helped a lot, also increased the oil pressure since it wasn't bleeding off into the cam valley. I'll be ...

Why did that post twice???

Inadequate crankcase breathing hindered oil drainback. This makes sense. Not really the case here. the late 4AGE, small port head, has a secondary oil return to make up for the inadequate oil return of the earlier models. It is a good size return, 5/8" I.D. planted in the head where OST had sh...

Inadequate crankcase breathing hindered oil drainback. This makes sense. Not really the case here. the late 4AGE, small port head, has a secondary oil return to make up for the inadequate oil return of the earlier models. It is a good size return, 5/8" I.D. planted in the head where OST had sh...

3/8" NPT on that? -8 flare?

Aw man, I hate these problems. To be honest I've been doing the same with my 1990 Toyota pickup. Different issues though, the thing runs but has CELs. Pain it the tailpipe! I feel for ya. Could it be a fuel issue? Good pressure until the engine runs? Like a restriction, fuel filter, pinched line, we...

From memory on my car before I changed the engine to 4AGZE, the resister pack bracket was bolted underneath the ignition coil bracket so they were earthed at the same time. I have seen that, I have also seen the resistors grounded with their own bolt. Basically any place you can access a bolt to gr...

The resistor pack does not need to be grounded. It is just 12V in and 12V out and there is no reason for grounding. OK, so I was shooting from the lip there. When the circuit is not active it is 12V in and 12V out, but when it is active it is more like 12V in and 3V out due to voltage drop across t...

The resistor pack does not need to be grounded. It is just 12V in and 12V out and there is no reason for grounding. https://i.imgur.com/xJWoyLP.jpg That makes absolutely no sense. The ECU is grounded to the chassis and the injectors, in order to complete the circuit, must be grounded to the chassis...

What about the ground wire that goes from the front of the engine to the chassis? So many people forget that one. Black wire with a yellow tracer with a black plug. Typically bolted to the front engine lifting hook.

Another thought, I had a similar issue with a VW squareback I had a long time ago, long time ago, the transistors burned out. That took a long time to figure out. Open the ECU and inspect the components, look for anything obvious like blown capacitors or melted transistors or resistors. Look for cor...

Our engines injectors are a 'batch fire' type of injection, it's why there are 2 injectors per ECU out. Typically cylinder 1 and 3 fire together then 2 and 4, since those are the cylinders that fire close together. So, when the injectors ground leads go to the resistor, which is 2 resistors in paral...

Ooohh, cutting the earth wires and just jumping the ECU to the block is BAD. The ECU is grounded to the block, but along the way from the block/manifold there are tap points for the various sensors for their grounds. You'll need to splice your harness back together. As for the painting of the earth ...

Pins and needles, pins and needles.

Sounds like an issue I had with one of my AE86s. Check the fuel circuit in the AFM. Try jumping the fuel test circuit at the diagnostic port. If the engine runs by jumping the fuel circuit then check the ground at the AFM plug. This is the ground bolted to the manifold, top of the runners under the ...

Head is no longer available. Carbs still available though.

As for pics of the oil routing I barely described, I never documented that set-up, figured no one would be interested. But if you can imagine, I drilled and tapped the hole for a screwed plug and gutted the pressure relief, installed a male flare fitting. Just bypassed the pressure galley in the blo...

Then I have no idea what the dealer is doing, but the hole was round, on four occasions. They didn't just keep giving me the same gasket, I still have them all.

The gaskets Toyota gets me have the round hole. The guys here can't seem to find the one I need.

That wasn't advice from Yoshi, I've done that myself, before Yoshi found out about it. My problem is finding a reliable source for the Aisin gasket. My latest install blocks the oil outlet completely routing the oil out the front of the pump assy. through an inline pressure bypass-filter-cooler back...

On the oil pump hole alignment. Welding and drilling is unnecessary. Aisin makes a gasket with an oval hole and a little porting in the block and pump housing is all that is necessary, just a port matching. No sense in taking a chance on warping the oil pump housing with the heat associated with wel...

If you have the funds, and a GOOD machine shop, have the oils squiters from a 4AG installed.

The latest model possible. Supposedly there is a 7A block that has oil squiters, I haven't seen one. Look to the '98 Celica as the corolla was not a "performance" engine(don't see how it would matter here). I can give you a 'go look at this' thing for your build. If you are using the 4AG o...