V6Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.
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When I ran it last weekend it got worse as it started warming up.
I'll check for codes again, but all I can think of at the moment is the MAF and o2 being used when it goes into closed loop.
What do these cars run like with the maf unplugged? I'm thinking about warming it up, turn off, unplug the maf, and then see what happens. I remember reading that once, but couldn't find it.
I'm going to check for codes again. I cleaned the plugs off (kinda black with no. 2 having a bit of carbon bridging the gap) and put them back in, but I didn't run it yet.
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various minor interior/engine mods 3.4 (I'll update the pic sooner or later, and maybe get it to run right)
Re: things that take over when the engine warms up
The o2 is the only thing that's enabled in closed loop. Everything else is already used. Removing the maf will only put in alpha-n which may or may not make it more driveable depending on if the maf is the problem. Did you ever replace the o2?
Are the plugs black & sooty or more solid like tar?
__________________ Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.
3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )
Re: things that take over when the engine warms up
They were more of a sooty look I think.
I fired it up, let it warm up, and I noticed it get a little rougher once the idle dropped down to normal, but not as bad as before.
Unplugged the est, and it was at 16, so I backed it down to 10-11. Wasn't as smooth as I would have prefered, but I shut it down and reconnected the est anyway.
Started up and seem to run a hair on the rough side, but thats about how it always ran.
When I press the pedal very fast though, it stumbles whether it's 700 rmp or 1500rpm. When I gave it a quick jab, it coughed and died.
The o2 probably has 25k on it. It's a Denso heated o2, but I can hopefully find one similiar tomorrow.
unplugged the MAF and didn't see any difference in the way it ran. Almost seemed like the tack was staying a bit steadier while idling, but just barely. That and the SES was on.
Only code I got was 42 (Ignition bypass circuit error) which I pulled before I unplugged the MAF, and I'm sure is from the EST being unplugged.
Re: things that take over when the engine warms up
If you unplugged the MAF and it made no difference, then maybe your MAF puked on you. Start the car and let it warm up a bit, then with the handle of a screwdriver LIGHTLY tap on the MAF and see if your engine coughs or stumbles. If it does your MAF is fried.
Re: things that take over when the engine warms up
Sooty means rich. Maf or o2. Probably the crappy digital maf.
__________________ Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.
3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )
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