If the engine is running fine/normally then the cylinder sealing is likely OK. The water leak is probably between the oil and water passages where they pass thru the head gasket... https://haynes.com/en-us/tips-tutorials/7-different-ways-head-gasket-can-fail Because the pressure differential is lowe...

I'm curious as to why your temperature would go up to 90 and then drop quickly when you rev the engine. Do you have a thermostat installed ? Do you have an electric cooling fan ? If your radiator overflow hose went all the way to the bottom of your soda can, and you fill the radiator to the the top ...

viewtopic.php?f=9&t=12283

Cheers... jondee86

The "sound" is reported as being temperature dependent and also that it suddenly became more noticeable. This tends to point towards some operating condition of the engine having changed. Without being able to offer any scientific reason, when I have been fiddling with engines I have found...

If you watch the first three minutes or so of the linked video, you will hear the "grunt" for want of a better word, produced by a typical 4-cylinder engine when the throttle is blipped. It is a kind of deep throaty sound and is very obvious on engines with open ITB's or carbs. It is mostl...

Suggest you talk with Battle Garage about Haltech... https://shop.battlegarage-rs.com/collec ... nd_haltech
They should be able to hook you up with all you need.

Cheers... jondee86

Take a look at your sparkplugs... do a plug "chop". Straight after the finish line or as soon as you can safely do it, switch off the engine and pull the plugs. Get hold of a jeweler's loupe or a 5 to 10 times magnifier and examine the porcelain part of each plug looking for signs of deton...

As you are using an aftermarket ECU it is highly recommended that you install a Wide Band O2 sensor and controller. The WBO2 sensor can read a full range of lambda values and the controller will process the sensor output into a 0-5V signal that your ECU can use to keep your AFR on target. The contro...

A long while back I looked to see if I could use the factory intake plenum on my ITB converted RWD car, but had to give it up as there simply was not enough room. I liked it because it had a decent volume, was a good solid two-piece steel box and I could have used the factory trumpets. The factory C...

Never tried posting/linking a video before, so hope this works If it does it will
be a short video from my archives that shows what my car sounded like when it was
running N.A. with ITB's and cams. https://i.imgur.com/JsnZvRJ.mp4

Cheers... jondee86

Best way to check for spark tracking or jumping to ground is when it is dark. Sparks are much easier to see at night. Idle sounds like an engine with a "hot" cam should. Fine tuning the ignition timing can smooth it out a little, and adjustable cam gears can can be used to open up the lobe...

The cam pulleys should be identical. The only difference is how they are installed with regard to the knock pins. Refer to the above sketch. On the intake side the knock pin is at around 11 o'clock in the first slot and on the exhaust side it is at around 5 o'clock in the second slot. - Did you chec...

Sounds to me like your either your cam timing is wrong or your ignition timing is way out. You need to take the top two parts of the timing belt cover off. Then turn the engine over by hand until the #1 piston is at TDC on the compression stroke. Check... 1. That the timing mark on the crank pulley ...

Are the PON cams designed to "drop in" using the OEM cam pulleys and the OEM cam timing marks ? By that I mean that the knock pins in the cams have been indexed by Tomei to set the cams at their design timing when used with the OEM pulleys and timing marks. If this has not been done then y...

Got some different wheels as I like this style better... https://i.imgur.com/qVSESWR.jpg Put some Bridgestone RE003 tires on them and have to say they are have amazing grip in the wet !!!! Upgraded the intercooler, flashed a MHD tune on the ECU and an xHP transmission tune. Refreshed the suspension ...

... and 16V coil, igniter, distributor and plug leads.

Cheers... jondee86

Two Things You Need to Do to Get Out of The Hole You're In ... If you are currently in a hole, here are two tips on how to get out. Stop digging long enough to recognize that you are in a hole. Digging the hole deeper will only make it harder to climb out. When things are going wrong, and you find ...

This link... https://locost7.info/files/engine/4age_blacktop/bt4-em.pdf contains all the information you need for an engine teardown. It is one of the links from locost given above and you should at least browse all the links so you can get an overview of how the engine works. When taking the engine...

Just checking... but you have checked that when the cabin control is set to full heat the heater tap is also wide open (spindle fully up) ? If the core was clogged I wouldn't expect the heater to work fine for a while and then suddenly stop working. None the less, I would suggest reverse flushing in...

No worries... I love a good mystery :) Was thinking that maybe the Ne signal from the distributor was weak until the engine reached that 4100rpm tripping point. If it was and if you have the VAST ignition system, then the ignition would stay at base advance (10 DBTDC) until the signal got strong eno...

My bad... was thinking the light went off at high rpm but wrote that it came on... DOH !!! You can make the checks and tests that I suggested. And if the light is ON when the engine is idling you can get someone to watch the CEL while you manipulate the wiring near the distributor. When the car is r...

1. Does the CEL light come on in every gear at around the same rpm ? Like if you go from a standing start and rev to 5000rpm before changing... does it on come on in every gear or only when you get to 3rd or 4th ? 2. If you raise the rpm to 5000 in neutral while stationary, does the CEL come on ? Th...

I'm interested to see how this works out. There are multiple writeups and videos showing how to modify and fit digital clusters into various old Toyotas, but not one of them identifies the required tacho input waveform. In fact most writeups kind of fizzle out due to problems in getting the dash to ...

I guess that a 16/20 4AGE is a 16V head on a 20V bottom end. In which case you will have obtained some increase in compression but otherwise the fuel and air requirements will not have changed much from the factory 16V setup. Thus if the OEM injectors were 210cc/min low-res then they would be your b...

Good progress... one problem at a time is the way to go :) AE86 does not prime the pump when you turn the key ON. The pump does not turn ON until you turn the key to the crank position. If the engine is slow to start when cold you should check that your cold start injector is working. If you have be...

I was meaning the heater hoses. A collapsed radiator hose would not make the heater run cold... more likely just the opposite. Some basic checks would be if you stop the car (but keep the engine running) after the heater starts blowing cold, does it return to blowing hot air without you touching or ...

Yeah... but I was actually referring to the skinny wires that take the pickup signals out of the distributor to the igniter or ECU. Should have described that better :) One of those wires sends the Ne signal and if the ECU does not get that signal for a few turns of the engine it will default to bas...

Hey brother... good to see you are still beating on an AE86 :D Sounds like you have an electrical problem going on. Assuming you are still running the OEM distributor, I'd say the first thing to look at would be the wires where they come out of the distributor. You are looking for a soft part in a w...

OEM replacement in terms of physical size, but with up-rated valving to handle modest
lowering and "sporting" spring rates. I believe that OST used 112's and found that he had
to be inventive in keeping 4.4 (?) kg/mm springs captive.

Cheers... jondee86