[glachhman]

Recently had my intake valves walnut blasted locally for really cheap but I'm still have a little cold start rough idle. Do you think my intake valves were really bad? Here's a before pic:

[135Pats]

Bad but not out of the ordinary.

['___']

Yeah. Mine were much worse both times I cleaned em.

[sirdaft1]

Those aren't too bad. For a comparison, here are how mine looked pre-walnut blast a few weeks ago...



And after they were cleaned...

[Pr335bob]

Wow! Awesome job. Did you have to reset adaptations after cleaning ?

[smittty634]

Those valves I have done cars a lot worse but would notice the difference when you decarb them. And when youbdondonthw decarb it does help to clear the adaptations .

[smittty634]

I'm able to clean the valve and clear adaptions of someone needs it done

[Rat_House]

Originally Posted by sirdaft1

Those aren't too bad. For a comparison, here are how mine looked pre-walnut blast a few weeks ago...



And after they were cleaned...

christ how many miles is that?

[mweisdorfer]

It might help to reset the throttle body. I think you have to put the key in position 2 and press the gas pedal all the way down for 10 seconds and the press the start button briefly and then let go of the gas pedal.

If not,

1) Run two tanks in a row of gas with 20 gallon techtron in it.
2) a new set of coils might be in order.
3) a new set of plugs
4) If that don't fix it, your next step might be to clean out the vanos Solenoids.
5) If not then, you should replace the Mass flow air sensor.

[David1]

Ignor the above recomendations except for the plugs. Cold start rough idle is usually caused by a leaking injectors. Techron won't do much.

[Jnat]

How is a leaking injector diagnosed?

[CHECKERED]

Originally Posted by jnat

How is a leaking injector diagnosed?

general misfire
plug is eroded
Bank rich code

[sirdaft1]

Originally Posted by Rat_House

christ how many miles is that?

It's possible that they were never cleaned by PO (over 130k on odo). The walnut blast freed up 25whp.

**Sorry OP, don't mean to thread jack**

[sirdaft1]

Originally Posted by jnat

How is a leaking injector diagnosed?

Rough idle. Gas smelling smoke coming out of tails. Wet spark plug tips (once removed).

[Jklad]

Originally Posted by David1

Ignor the above recomendations except for the plugs. Cold start rough idle is usually caused by a leaking injectors. Techron won't do much.

My cold start rough idle was caused by a faulty hpfp. Once replaced it starts normal. I Was getting code 2b2c every once in a blue moon. Car would start up rough on cold start for a few seconds, rpm's high, then nose dive, then bouncing aroind before settleing. Is your car cranking more than 2-4times before starting, accompanied my rough start? If so, could be hpfp.