Yay, more stuff to fix!

[BigMac76]

Ok now since the weather is starting to get better my car doesn't want to run like it did this winter. It's almost acting like it was earlier last year before Don rewired the fp relay.

Have noticed a few things that happens when it seems to start acting up. The main one is temperature related,only happens when the ambient temp is greater than 60 or so degrees out. Car doesn't act up in the mornings just yet. Not sure if it is voltage related, but again, in the mornings the car will run about 14.2 volts, and for some crazy reason, afternoons when it's warmer out, only runs to about 13.4v or so volts(didn't put a dvm on it just eyeballed it according to the gauge).

While the car is chugging, the oil pressure drops to 30-35psi and starts acting relative to engine load (higher rpm and pressure comes back up). It almost seems like a pretty bad miss, or vac leak. rough idle, hesitation and almost completely unresponsive throttle at times when it gets pretty bad.

It only does this on idle, so leads me to believe it could be a few things related to it.

A) Vacuum leak - maybe somewhere in the PVC line system or manifold related

B) IAC or TPS - only does it when the car has ran for about an hour after driving home from work. Doesn't act up in the mornings when it's cooler.

Also had a P0171 code show up the other day, I think it's just because I was trying to get it home. Cleared the code, but had another one pending today as well that didn't trigger the mil lamp. Below is the list of the readings from my scanner when the mil triggered yesterday:

TROUB CODE P0171
ABSLT TPS(%) 0.4
ENG SPEED(RPM) 896
CALC LOAD(%). 2.7
MAF(LB/M). 1.02
MAP("HG). 8.6
COOLANT TEMP(F) 174
ST FTRM1(%). 6.3
LT FTRM1 (%). 24.2
ST FTRM2(%). 9.4
LT FTRM2(%). 24.2
VEH SPEED(MPH). 4
FUEL SYS 1. CLSD
FUEL SYS 2. CLSD

Anybody want to chime in? And Don if you get to read this, got some free time to play with my car again?

[Z28]

Its the opti...jk I have no idea

[BigMac76]

Lol, wish it was that simple.

Noticed the lean bank 1 code came back yesterday while I was viewing data while the car was acting up. For some reason o2 data isn't saved in the freeze when the mil is triggered. But not showing p0174, makes me wonder if it is real or maybe a leaking intake on the drivers side.

[BigMac76]

Ok, after some digging around today while sitting in front of the house I noticed something that might help diagnose it. Short term fuel trims steadily rise while the car starts to chug and spike up past the lt fuel trims, >24.2.

Took a video of it and attached it below...

[SLP IROC-Z]

probably a bad o2 sensor.

[smokinss]

Did you check to see if one bank has fouled the plugs?

[Slowhawk]

Both of the 02's are lean. Could be a major vacuum leak, bad mass air meter.

Of course we can check it out for you. Should be a simple fix.

[BigMac76]

Are you going to be around Saturday, Don? Maybe I can swing by if you're available. I did manage to get a video from the front of the car near the airbox where it's ported and when giving it some throttle, you can definitely hear it sucking in air. Not sure if it's from a big vacuum leak, or just the normal air intake from the tb, but it is pretty loud.

Will see if I can get the video posted here a bit later on today.

[Slowhawk]

I was there 12-4 today.

You work close to here. Lunch break?

[BigMac76]

Yup, kind of. I am in the industrial park off 495 behind the Holiday Inn off Bay Street. Maybe 10 mins away at the most with traffic.

If you're around on Monday let me know, will give the shop a call in the morning around 10 or so. I'll be at work and might just take an extended lunch break.