:cry: Wrong Octane - Now Massive Backfiring

[JDog_27]

Well over the weekend I had about a 140 mile drive ahead of me. Had maybe 3-4 gallons 92 before I hit the gas station to fill up. Being stupid I wasn't paying attention and had the attendant fill up with 87 (you don't fill your own gas in Oregon). By the time I realized my mistake the tank was full of 87.

Crap! Figured I'd be okay as long as I stayed out of boost. Well I made it about 80 or so miles and cruising about 75mph in 5th gear when the car started to bumble and stumble. I had the radio up so I thought I was running over a bad patch of road but then i heard a loud bang...felt like the whole underneath of the car exploded. I let off the gas and coasted to the side of the road while the car was giving off a rapid fire of backfiring/sputtering. Had to really steer it to the side of the road.

While sitting there at idle the car gave off one last bang and then idled fine. Got out and checked everything and all looked good...no CEL either. Luckily a friend happened up on me so we both talked then i decided to get back on the road to try and find an off ramp/gas station. Went about 10 miles then it repeated at 60mph. Friend said a big black (jet black) of smoke the size of a basketball shot of my tailpipe as my tailpipe went side to side then followed by smaller sized sputtering of black smoke. Ended up getting the car towed home...Yay for TripleA.

Sorry for the long post but figured I'd share the before story. Now my question is would the lower octane rating have caused this? I'm running a AEM EMS and not the ECU so not sure if the EMS would have saved me from screwing up on the wrong octane or is this a whole different issue? Pulled and replaced spark plugs yesterday. Car idles fine, a little high at 1200rpms, and no audible weird noises coming from the bay. Still on stock FPR with 255 pump (bad fpr?)... oh and I still have a full tank of 87 sitting in the car...

Any and all help is appreciated.

 

[DSM1G90]

ya, disconnect the wastegate rod from the actuator so the gate is held open. that disables the turbo so you can definitely stay out of boost. Just have to watch the gas pedal a bit-does a great job when you're turbo has problems prior to replacement..

Octane booster is usually only able to bring up the octane rating a couple of points if your lucky

At least, the two point increase is better than no raised points at all.. at least trying is better than not trying at all ..

 

[black_gst]

Hey man, I've had the same crap happen to me. I went to AMPM on Lancaster here in Salem and the idiot there filled my empty car with regular gas after I had told him TWICE to make sure he filled it with premium.

I come up to the counter since I went in to get a drink and did not watch since I figured telling the idiot TWICE what to fill it with would get it through his head that I wanted PREMIUM... anyway the guy says its only 27 dollars which I found weird because its always been at least 32 bucks so I asked if it was filled with premium and he said no. So I said I wasn't going to pay for it since I clearly said I wanted premium and the attendant actually did agree with me and said sorry. As I was about to leave a cop came in and they claimed I was trying to not pay for my gas so I had to explain everything to him. The cop agreed it was total BS what they did and it was their fault but said since he was not there when they did it he could not help which is BS also but anyway because of him showing up I had to pay for their idiot mistake.

All I can say is if you want to run it out instead of trying to siphon it out DO NOT hit boost. I'm not going to say its fine to run it because you do still have a turbo making a bit more power. I did run it through on mine staying out of boost though I do not recommend doing it at all.

FYI my friend destroyed his 95 Eclipse by continuously filling it with 86 octane and hitting a full 16 PSI several times a day.

Just use your own judgment and ask yourself if you fill it is worth the risk.

i think you guys should get magnets that say "premium only" and put them above your gas door.

id tell the to pump that shit gas out of my car

 

[DSM1G90]

Prob why these "trained" attendants shoot in the 87 is that the usage for 91 is actually quite rare.

There is not that many vehicles made that requires the higher grade-just those specialty vehicles that you rarely see on the road- and these "trained" attendants get stuck in that one mode of "get the customer serviced and done quickly for the next customer" that 87 is what they pump in, and not listening or paying attention to what the customer really wants.

It's the same like if one goes to a movie theatre and ask for "unbuttered" popcorn and the attendant, used to doing butter topping on practically every sale that she does, shoots the oil on the popcorn .. and the customer quickly yells at them "UNBUTTERED, PLEASE"!

Have to slap these "trained" attendants around sometime ....

Sad thing, is that if you did do the magnet sign trick of "Premimum Only" above the filler door, that half of these "trained" attendants probably can't (or, don't want to) read anyway.

-DSM

 

[JDog_27]

Yeah I would much rather pump my own gas...although it's nice when it's butt cold outside

Anywho, got the fuel tanked drained and a fresh tank of the good stuff (92) put in. Took her out for a short trip around town but didn't get above 45mph and didn't boost at all. Seemed to run fine. Also gave her a couple 6K revs with no odd noises.

Going out tonight to hit the hwy and see how it goes as the problems appeared when I was cruising in 5th gear. Hopefully this time around I can avoid TripleA

 

[1995gsx20g]

id tell the to pump that shit gas out of my car

YES. because even if they didn't pump it out and gave it for free they would remember you and never pumped 87 for you ever again. they also could refuse your business but what ever happened you would never get 87 from that place again