Supra MKiv tt auto - limp biscuit 🙄 ECU problem???

[Steviegeeza]

Supra Mark 4. Twin turbo auto 1993 

Decat 3" pipe greddy boost controller. Approx. 100,000 mi 

 

Problem, when in drive will not rev above 3,000 RPM so is pretty sluggish, 2nd turbo never spools up.

Will not go into overdrive, overdrive light intermittently flashes, warning triangle occasionally comes on, no odb1 fault codes when shorting test link.

 

Car had not been used for around 6 months, as usual it started on first turn of the key, took it out for a Spin. Seemed to be in some sort of limp mode then started running really rough. Discovered one of the spark plugs, denso ik22 cylinder one, was faulty so replaced. Back firing on all 6.

I pulled boost pipe from inlet manifold and revved it, getting boost pressure so at least one turbo is okay. Put in fresh fuel and injector cleaner. 

Took it out for another spin, this time holding it in low gear, and revving it gets past 3K RPM and into hyperdrive, a peak reading of 1.04 bar on the greddy.

 

I assume that this must be the ECU as auto fluid is nice and clean, I never had a problem with the box and the car was okay when I put it away 6 months ago. 

Do readers think I'm correct in this assumption or have I missed something?

 

Does anyone have a good ECU I can loan rent buy before I take the old one out, take it apart and check the caps. Don't want to risk buggering it up without a spare. 

Many thanks in anticipation 

[email protected]

[Probby]

Absolutely no expert but from what I hear that sounds like ECU related fun  definitey see if you can borrow an ECU from someone local to confirm real quick.

Edited 21 hours ago by Probby (see edit history)