This is in an MR2 right? Did it ever run correctly, or is this a new problem?

Was the fuel pump changed for the swap? I see the aftermarket FPR there, what pressure is it set to? How is the fuel filter set up? If there is no charcoal canister, how is the fuel tank vented?

Did they wire up an OBD port where you could connect a scan tool?

 

It is, and no obd2. Tried wiring it in and no scanner would read the ecu. As for the rest I have no idea. I think ive had the problem since getting the car, however someone that drove it when I first got it said the issue before was like a misfire but not anymore.

 

Very first emission control device, do not remove it, Exhaust Gas Recirculation inhibits preingition and lowers NOX. You probably have a routing diagram underside of hood. Do not recommend causing more problems than you already have. find the root cause and fix that. So tell us exactly what codes are stored .

 

Thats another issue, I wired obd2 into the ecu and cant get any scanner to read it. Looks like I have a different ecu to what I should have for my vin so im wondering if that could be the cause? However trying to source such ecu is proving to be a task

 

The EGR is already removed, you can see the block off plate in the picture.

 

I know, the egr and cannister is already removed by the person that did the swap. However based on how bad this swap is, I dont think the vac lines are connected to the right places

 

When I first had mine going (1MZ in AW11) the fuel filter I used was too small. It ran great for a few thousand miles but then it started to buck at WOT. Pretty quickly it got so bad that it would buck even under light acceleration. I swapped to a larger fuel filter and that solved everything.

If there's any way you can get a fuel pressure gauge on it, even temporarily, I would start with that.

Make sure the MAF sensor is pointing the right way too.

 

I have a fuel pressure regulator on it and it currently sits at around 55psi. Ive seen some at 40 and heard people say to use 60

 

55 psi is fine. Can you watch the pressure while you drive? You can have 55 psi at idle but if the pump is too small or you have a restriction somewhere it will fall off as the flow increases.

For the vacuum lines, here is an example. These vary by year and market though.

With an aftermarket FPR, no canister, and no EGR you basically just need the ACIS to be set up, everything else can just be capped. Figure out how your fuel tank is vented and don't cap that though - probably should install a rollover vent if you don't already have one.

Did they install the little vacuum tank for the ACIS? You definitely need that, it won't work right if it's just connected to manifold vacuum with no reservoir.

 

There's a pipe along the passenger side that the tank vents from. Looks like a cut vac line and is just left pointed to the floor. Im not sure what the vac tank looks like for the acis. Also I fitted a walbro 255 fuel pump when I practically changed everything sensor wise on the engine

 

The vacuum tank looks like this. One port goes to a manifold vacuum port, the other goes to the VSV for ACIS. It's the "vacuum tank" in the diagram.

The port that goes to the vacuum source has a check valve that will let air out but not let air in.

 

Dont think ive seen this

 

If I recall, the V6 Camry with the 1mz from 95 /96 got OBD 2. 95 was the first / early year for this car / motor.


What ECM is running it? it could be an incorrect ECM or perhaps a bad ecm or wiring seeing as it won't communicate.

 

If I recall, the V6 Camry with the 1mz from 95 /96 got OBD 2. 95 was the first / early year for this car / motor.


What ECM is running it? it could be an incorrect ECM or perhaps a bad ecm or wiring seeing as it won't communicate.

I tried another ecu with the same part number and it didnt fix my issues or obd2. However I found out that the ecu on my car isnt the one that matches my vin. Maybe the ecu I have now isnt obd2 compliant or it uses different obd2 pins from the ecu. This is the ecu I have.

View attachment 494975

 

The link doesnt work but from what I recall all 1mz had OBD 2...was an early adoption i believe on toyotas part....... apparently it was first available in 94 not 95 like i thought. but looks like an Im assuming OBD 2 ECM would have the more rounded connector designs below.... the white one throws me off though.... I would diagnose communication errors and what not first since it wont connect / talk.. then from there there might be something wrong.

Part numbers on rock auto seem specific to years.





95

96

older style

 

The link doesnt work but from what I recall all 1mz had OBD 2...was an early adoption i believe on toyotas part....... apparently it was first available in 94 not 95 like i thought. but looks like an Im assuming OBD 2 ECM would have the more rounded connector designs below.... the white one throws me off though.... I would diagnose communication errors and what not first since it wont connect / talk.. then from there there might be something wrong.

Part numbers on rock auto seem specific to years.





95
View attachment 494976



96

View attachment 494977


older style



View attachment 494978

Yeh, i really need to figure out the obd2 issue however im not sure what the cause is. Everywhere ive looked appears to show the same wiring as ive followed. Not much to go wrong with. SIL and SG are the only wire out of the ecu.

 

My 1mzfe doesnt appear to be running the vacuum surge tank either