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So i let my brother in law borrow the car to and from work for a few days while his car is being repaired. He was kind enough to put gas in it but i forgot to tell him all ive been using was 91octane gas and he put about 5gallons of 87 in it. car drives fine prior to this and he immediately calls me and said that the car is acting funny. I drove it a few miles afterwards and the car has erratic idle and hesitation at around 25oo+rpm. It was very difficult to drive and it stalled about 3 times when i drove it around. I then drove it to the gas station and put about 4gallons of 91oct in it to see if it was the low oct gas causing it. Still drove the same after i added more gas in it. What could be the cause of the this problem? Is it possibly a bad batch of gas from the station? I mean, even with 87 octane it shouldnt run like crap all of a sudden right? Do i need to drain the gas and how do i do this? Is there some sort of drain i can open underneath the gas tank? TIA

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My feedback thread:

http://www.4g61t.org/phpBB2/viewtopic.php?t=18146

87 octane causing the problems, I don't think so, but it's not good for turbo cars. Getting a bad batch of gas at the station has happened to me only one time, and that made my Nissan Pulsar run like poooop till the next tank. Something else may be wrong here.

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Good stuff - trucks bring it!

I thought it was a boost leak at first but all my clamps and tubings are all connected very securely. Also the CEL comes on and off at times. Does a bad batch of gas can cause the CEL to come on intermittently? So is there a way to drain the tank without taking it all down?

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My feedback thread:

http://www.4g61t.org/phpBB2/viewtopic.php?t=18146

No, I don't think bad gas will throw a CEL....but like I said, there might be a problem and you should find out what the ecu says is the problem. These things happen from time to time with parts.

I thank my lucky stars each time I start my car and arrive at the destination without something STRANGE happening. That's just me though. I'm always under the suspicion that something bad could happen cause I've almost died in the damn car, and that kind of makes a person paranoid.

You know what....don't listen to anything I said except to check for error codes.

To answer your question about the gas tank, I don't know about csm gas tanks that well. I did drain all the gas from a car once and there was a bolt on the bottom of the tank in the center which I took out to drain the gas.....and I've never been so high in my life!

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Good stuff - trucks bring it!

If your engine and tune are built anything like mine then your head would be lifted. I put 87 in mine once, and I had to crank the boost all the way down. Even then I couldn't get into boost at all without link flashing the CEL to warn of knock.

I hope you have near stock compression and boost.

i have a built motor with near stock compression and stock boost on the tired 14b

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My feedback thread:

http://www.4g61t.org/phpBB2/viewtopic.php?t=18146

I would toss in some new NGK's, they're cheap.

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual

I was just about to drain the tank and put fresh 91oct gas in it but i had this spare ecu and decided to see if that was the problem. Plugged in the spare ecu and voila, car purrs and drives like new! So i opened the old ecu and it smells like dried fish in there, there was a slow leak on one of the capacitor. Sucks, i should have swapped the caps logn time ago. Lucky it was not an eprom ecu.

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My feedback thread:

http://www.4g61t.org/phpBB2/viewtopic.php?t=18146

I was just about to tell you to check the ecu, lol. Glad you figured it out.

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-'92 TSi AWD - Daily driver
-'93 TSi AWD - 4G64/HX35 build underway
-'89 Colt - 4G63 Swapped, Almost done!
-'86 Starion ESi-R - Someday 4G63 Swapped

Send the ecu to Dan on here, he should be able to save it.

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual