Trouble today

[Mike M]

It was 110+ degrees today which could have something to do with the problem I had today.
Drove the car for about 30 miles today in the heat (AC works great!) and even thought to myself how great this car runs. Then I dropped my kid off at home after lunch and as I was pulling out of my driveway I felt the car idling rough, real rough..in fact it started missing on more then one cylinder. Barely could move the car 10 feet as it seemed like it was running on about 3 cylinders. I slipped it into neutral and then it came around and after a few seconds and all was well. I drove it 1 mile back to my shop but when I slowed down for a red light I felt it happen again only this time it was even worse and I coasted to a stop. I had the flashers on in the fast lane and tried to restart it but it wouldn't start. Waited about 1 minute and then it started and after a few revs it ran normal again. My shop was so busy I had no time to look at it tonight but it felt like either it had way too much fuel pressure or not enough when it happened. Also the reoccurring p0190 that I have been getting from time to time for years popped on when it happened which also leads me to think it could be a fuel pressure related problem.
I check engine temp at the time and it was 224 degrees with my scan gauge but couldn't get my eyeballs on fuel pressure quick enough.

[RacerX]

Because fuel boils at a very low temperature, our stock tunes raise the rail pressure quite a bit when things get hot. I lowered mine in my tune in preparation for those hot days, especially at the track. @ 224 degrees, you should be @ 62psi from the tune. You could see if it works by setting all settings to 40psi in Injector Pressure Drop with change in ACT.

I know this is silly, but, you have the FRPS reading vacuum and boost, right? Had to ask. Make sure those tubes are clear too.

[Mike M]

That makes a lot of sense. I have to spend some quality time with my tuning software. What fuel pressure are you seeing at idle?

[1stMerc]

You have a 180 stat. Where do you have your temps set?

[Mike M]

You have a 180 stat. Where do you have your temps set?

I have a 170 degree stat, forgot to change my info (fixed).

What temps are you speaking of, fans?

[1stMerc]

Yes, fan settings within the tune.

[Mike M]

I will be hooking up the laptop this week, I never adjusted the fan settings since installing the 170 tstat.

[fastblackmerc]

Good info on fan settings.

http://reischeperformance.com/tstatinfo.html

[Mike M]

Good info on fan settings.

http://reischeperformance.com/tstatinfo.html


Thanks, I need that.