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745T-5.0 HO Tune up time- advice please ?

posted by  wongg3 on  Sat Feb 9 13:48 CST 2013
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last visit: Tue Oct 21 20:12 CST 2014
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Hey Bill,

So did the downpipes/cat pipes fit your 740 without modifications? Just curious.

When you say that you failed emissions, how did you fail? Do they do a smog test? Which numbers were off? Do they just check to see if the engine is throwing a code? Where do you live?

If you've been using injector cleaner periodically, and the engine runs ok I wouldn't change the injectors yet. I think that other things might play a larger role.

Wires/plugs/cap/rotor is always good if they are old. Definitely check the base ignition timing.

Check for vacuum leaks. All those little hoses, especially to the MAP sensor.

If the O2 sensors are old, think about replacing those.

Fluids/filters are good to change of course, but they're generally not going to affect your emissions unless they're really messed up.

And clean the throttle body and idle control valve. Then adjust the TPS.

Clean all your grounds and/or add good grounds.

Sounds like you're gonna be ready for the next 100k!

Greg
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