How to resolve some bad gas?

[Martin in Bellevue]

Immediately after filling up at some stop 'n rob I hadn't been to before, it starts pinging & running poorly. Since then, I have pumped out 3/4 of the tank, into garage gas cans & the minivan. I swapped in a new fuel filter just a while ago, after filling up with 92 octane at the usual known gas station. I also replaced the spark plugs, cap & rotor, & reinstalled the original coil & chip. The other ignition coil was a spare from a parted car of last fall. I checked the gap of the crank sensor. The MAF worked on Jeff's car since the pinging started.

I did, immediately after the pinging started, look up Winfred's posts regarding sucking a few ounces of water though the intake. I sucked a few ounces though the intake at above 3,000 rpm. A plume of smoke was created & kinda lingers.

Have I missed anything in resolving this?

Could I have jumped timing on the m30? Does that happen? It will rev up pull to redline, just not happy about off idle through midrange.

[MBXB]

Throw in a can of gas line anitfreeze (Heet). It's just alcohol, mixes with water and burns off. Voila.. Water is gone from your tank.

[Bill R.]

settings on the maf have altered? If you richen it up a notch does it help?
Or could the gas have contaminated your o2 sensor giving you a false reading now... You've looked at all the usual suspects, vacum leak between the maf and the throttle body...or any other manifold vacum leaks...

Immediately after filling up at some stop 'n rob I hadn't been to before, it starts pinging & running poorly. Since then, I have pumped out 3/4 of the tank, into garage gas cans & the minivan. I swapped in a new fuel filter just a while ago, after filling up with 92 octane at the usual known gas station. I also replaced the spark plugs, cap & rotor, & reinstalled the original coil & chip. The other ignition coil was a spare from a parted car of last fall. I checked the gap of the crank sensor. The MAF worked on Jeff's car since the pinging started.

I did, immediately after the pinging started, look up Winfred's posts regarding sucking a few ounces of water though the intake. I sucked a few ounces though the intake at above 3,000 rpm. A plume of smoke was created & kinda lingers.

Have I missed anything in resolving this?

Could I have jumped timing on the m30? Does that happen? It will rev up pull to redline, just not happy about off idle through midrange.

[Martin in Bellevue]

I've checked for vacuum leaks. The MAF ran well on Jeff's car the other day, since the problem started with my car, seeming to not be the cause of problems.

I was stunned at how immediate the problem occurred with the bad gas.

Thanks for the ideas, Bill.

settings on the maf have altered? If you richen it up a notch does it help?
Or could the gas have contaminated your o2 sensor giving you a false reading now... You've looked at all the usual suspects, vacum leak between the maf and the throttle body...or any other manifold vacum leaks...

[mike wong]

I like Techron - in the bottle. Techroline from the gas pump is diluted.
also heard Redline has a similar product.

[thunderman]

I take beano for bad gas

[Bill R.]

MM head right?

settings on the maf have altered? If you richen it up a notch does it help?
Or could the gas have contaminated your o2 sensor giving you a false reading now... You've looked at all the usual suspects, vacum leak between the maf and the throttle body...or any other manifold vacum leaks...

[Martin in Bellevue]

So, just as a refresher, how does the m30 run when say, the headgasket fails between a pair of cylinders?

Yeah, I went ahead & put a call in to bma for a gasket, bolts & such. I've been thinking about a "preventative" head gasket job for a while.

The plugs don't read this too likely. I don't think this is necessarily the issue.

[George M]

Martin...I have some bad news. When you and Jeff were doing all the baton passing with your car parts, Jeff dropped the MAF during the hand off. I have no choice but to bench him for the summer games.
George...aka Hanky Sr.

[George M]

oh...and be sure to listen to Thunderman's advice about "bad gas".