Alright guys so i just installed a 7mge tb off of an 89 cressida onto my 22re and everything came out perfect. only problem i have is that now my truck surges when its in neutral and i give it partial throttle. and when i drive it at partial throttle it stutters and sputters and kinda shakes a little. and at idle and full throttle the engine runs perfect. im stumped i already bought a brand new tps thinking it was the problem and i even followed Lcengineerings tps adjustment procedures. Any help you guys??
forgot to add the 7m tb came with the tps and its the same part# as the 22re's. i tried all three of my tps' and neither of them worked :/
i did add more fuel by adjusting the afm i even maxed out the afm's fuel delivery and it made no difference. i believe it has to do with the tps now.
I had the injectors cleaned and rebuilt at the same time so the injectors are good as new, Also i installed a brand new nippon fuel filter. the 7mge tb does not have an idle air valve or at least the one i have does not. and i cleaned out the tb very very well it was cleaned in and out.
what is the bigger TB supposed to do? i cant see it giving more power cause the choke point on these engines is down farther in the system in the head and port design.
So what are you doing for idle control then? All versions of the 7M came with a separate electronic IAC. It's also a matter of just how big the tb is. for quick movements of the throttle the ECU relies on guessing what the airflow is because the AFM reacts slower than you can move the throttle (not because it's mechanical, just because it's earlier in the system. same thing happens with electronic MAF and even MAP systems) the TPS might be perfectly fine but when you open it, you're getting more air than the ECU expects. at part throttle it's continuously moving.
Alright been doing some research and still no luck. Well the reason is for the biger tb is so it can move more air obviously this is a choke point and even though its not the biggest choke point this will still improve the amount of air to the cylinders. I have not messed with the distributor timing but next time i have the tb on the truck i will. But i dont see how the timing would cause surging at part throttle There is no idle control, it idles as smooth as the stock tb if i needed to adjust the idle i would have to do is adjust the throttle stop screw. so if tyhe tps is fine how can i get the engine to stop surging on partial throttle??
put your ohmmeter across the idle contact pins in the TPS and adjust it so the idle contacts are only closed when the TB is fully closed. tap the throttle and let it snap back a little to make sure it's going back and closing the switch but make sure it's off the switch as soon as it moves. That's assuming it's hitting decel fuel cutoff. if that doesn't fix it, it might just be more air than the ecu can compute, which would be surprising.
So been a while but any of you guys have an idea as to why this might be happening? I dont want to give in and buy lce's big bore tb. Help me figure this our so you guys dont have to shell out the money for Lc's!!!
Did you remove the intake manifold ? Vacuum leaks at partial throttle ? Kinda sounds like a fuel pressure building up loading the motor up to me then again not familiar with the 7mge tb
Yes intake manifold was removed and all new gaskets installed. looked everywhere for vacuum leaks and couldnt find any. not sure how the fuel pressure would be building up?
Yea just pickin the brain my friends 5.0 mustang surged at speed and idle and it ended up being a faulty fuel pres regulator but then again it's a ford . Not to sure about your problem have u figured anything out or is still acting up
The last time I clean my tb it mess up the tps. so I had to get a new one. put it on and did not adjust it right. ran good until i did smog. told the tech about it, he adjust idle and timing correctly, pass smog, but run like sh!t. Idles fine until put into gear. shakes and sputter and no power at all. readjust the tps correctly and now runs perfect.
