Re: Hesitation than cleared itself
 

Might be a bad O2 but that will throw a code check engine light come on at all?


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Re: Hesitation than cleared itself
 

Where is your MAT located?

Re: Hesitation than cleared itself
 

George....No code ...Had a bad one last year and swapped out..

Re: Hesitation than cleared itself
 

Fully warmed up, turn on headlamps, come to a stop and wait to see if idle will slow and SES light illuminates. Also can implement additional load of the Air Conditioning running (blower motor max setting 10). If it acts like it wants to stall, you probably have my custom tune installed on your car...lol.

I've become immune to this occasional condition due to being slightly lean at idle...no big deal.

Re: Hesitation than cleared itself
 

George,

His car is a 91 so ur tune wouldn’t work unless someone “translated” it for a 91.

Re: Hesitation than cleared itself
 

I had encountered poor driveability when the weather changed and I was still on winter blend calif gas when we had an 80 degree warm spell in February. Run through a tank before you spend any money

Re: Hesitation than cleared itself
 

I agree that fueling may be @ issue. Scanning the ALDL port will give you a pretty good idea how it is running. (O2s don't always throw a code - at least not right away. They can be failing or getting weak long before failing completely to cause a code (I've found).

Besides O2 function, you will be able to get a dynamic evaluation of ALL the sensors: a good place to start!:thumbsup:

I don't want to start speculating until we see what the scanner says first. JMO.

Re: Hesitation than cleared itself
 

Thanks guys....Not too familiar with scanners and such.....Will run this by my guy tommorow or the following week....Will keep everyone posted on the outcome..Which in turn may help fellow members,if such a problem arises with others...

Re: Hesitation than cleared itself
 

Was ur MAT sensor relocated?

Re: Hesitation than cleared itself
 

John, I have Vetronics Tech1A scanner with master cartridge updated...and extra O2 sensors.
Let me know if I can be of assistance to you.