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They are a joke. They are a resistor that changes the intake air temp sensor reading to the PCM/ECU. So cold start fueling will be off, timing will be off, WOT power I would bet is WORSE. They are selling you about $0.10 in parts for $60 to gain you nothing. Ask them for the dyno...

My brother in law had that happen on a Mazda B2000 pickup.

Anyone ever hear of breaking a plug off? Friend works at Lexus dealer and has never seen a broken off plug in his 22 years there.

I have a 1UZFE in my 98 GS400 and went to pull #1 spark plug out and it seemed very hard to pull out, I pulled the next plug (#3?) and it seemed better, but didn't come out with the ease that iron head engine plugs come out. Engine was cold when I tried to pull them. Any tips/advice? I don't...

I would love to get a PCM, but the shipping from there to the US would be too much... I am looking for one to take apart for some other stuff.

Yup, gave it a lot of thought. Was looking at EFIing the 400 Poncho for it. But alas, not enough time to get into doing it. I guess another way (on the fly, if the way you are doing it does work out) is to install a butterfly valve in the intake port and close it and shut off the injector...

Problem with an air bleed is it is going to be worse at lower rpms and almost unnoticeable. You really should address it with the MAF or with the injector flow rate. Most car companies run very rich at WOT, rich is SAFE, it also keeps cat converters from melting prematurely. But you can...

I was looking trying to do that to a Pontiac 400, but I couldn't easily solve the way to push up on a rocker arm or to force both valves to be closed. I was going to interrupt the injectors and just leave the distributor sparking into nothing (just a bit hard on the cap/rotor with no load on...

I'm the new guy here, but I know many GM engines (Pontiac V8, Chevy LT1/LT4, Buick 38000 Supercharged) like the back of my hand. Just picked up a 98 GS4, great platform car so far (couple da)/. But on the GM stuff, hp/L GM is doing almost as much as most anyone else is with DOHC engines...