Newbie Gt4 Owner.

[daktari]

Hey guys.

Recently got a 91 ST185 and have a slight problem.

History might help as i reckon it could be a couple of things.

Full Toyota service history. 117K on the clock. Full stainless 3inch Scorpion exhaust. Blitz air filter and dump valve. Aftermarket boost guage. No other mods that i can find. (yet!!)

(Incidentally, the boost guage is reading 6psi at full bore. Is this about right?)

The problem is what appears to be a slight misfire on full boost. Although it has been suggested to me that it could be a fuel related problem. Also there is an occasional backfire on the overun from medium to high revs. The symptoms are there all the time wet or dry although i think it might be worse when wet. Not really had much rain.

Any help would be appreciated.

Regards

Dak

[djdna2000]

Change the plugs, leads, dizzy cap and rotor arm, and fuel filter. 99% of GT4 misfires/hesitations are caused by these items being worn.

6 psi is about right, possibly a little low which would be consistent with the age of your turbo.