jason's education thread

[motorhead]

Have him pay you to run his car... even a dollar, and have a contract whereby he employed you for that purpose.

I've had instructors run my car at auto-x events... with me in the car of course.  As the saying goes: don't race anything that you cannot afford to push off a cliff.

[good2win22]

Ok Steve... I need a little help with understanding numbers from the logger.  I don't have a file to upload. I can later though.
This problem has reared it's head again...
 
Allegedly, this is a classic symptom of a vacuum leak but the numbers don't add up in my head.  O2 millivolts reads in the 890's but BL still throws fuel to it sitting at 142 hot in drive.  Why does the ecm still think its lean?  What other variable is involved with the ecm in the calculation. 
 
I've checked every line from the vacuum block with a hand pump vacuum guage. Found some minor leaks but nothing huge and I fixed all the minor leaks. I've removed the valve springs, pressured up the intake side from the turbo, sprayed with soapy water and found nothing.  I've decked the exhaust manifolds, installed gaskets, smoked check the exhaust side and found nothing.  I changed the orings on both the input and return lines of the fuel rail and FPR.  Even changed orings on the injectors.  I've played with fuel pressure settings and seen changes in the other blm blocks that are consistant with more fuel and less fuel...  No cracks on either header....  I'm a bit flustered

[Scoobum]

I'll assume it's a TT street chip burned for 18 lbs. The big question. Was it burned for your EXACT combination? There's numbers on it...and Eric can tell you what it was set up for. Just because it matches your injectors doesn't mean squat.

[good2win22]

I'll assume it's a TT street chip burned for 18 lbs. The big question. Was it burned for your EXACT combination? There's numbers on it...and Eric can tell you what it was set up for. Just because it matches your injectors doesn't mean squat.

Chip is burned for this exact setup and chip and injectors came from him.  Yes there used but I sent the chip back to him and had it burned for this current setup. 

[Scoobum]

It ain't the chip. Does it have an RJC PCV valve...cuz they can act like an air leak. Have you tried a new PCV valve? Is everything set correctly in the Translator? Intake gasket okay?. For shits and giggles I'd remove the EGR and use a block off plate.

[Steve Wood]

Is this at idle?

The maf is giving you the correct flow numbers for idle?

There are no leaks around the egr valve base and it is sealed (diaphragm wise and plunger) at idle as it should be

[good2win22]

Is this at idle?

The maf is giving you the correct flow numbers for idle?

There are no leaks around the egr valve base and it is sealed (diaphragm wise and plunger) at idle as it should be

Yes this is at idle.  MAF is reading 4. I have a translator with an LT1 MAF.  EGR is blocked off and sealed up tight.  Yes I have an RJC PCV and I have a stock one I could swap in. 


wonder if I have an intermittent translator....

[Steve Wood]

if it reads 4, then the ecm is getting the correct data to set the fueling with.

[Steve Wood]

One of the common problems I have seen is a fuel pressure gauge that is not reading properly.  Another one is the use of a three wire O2 sensor that does not fail properly and give a trouble code.  Without a wb to back up the O2, sometimes it's hard to see that it's bad.

[good2win22]

Played with the translator settings a bit yesterday and had some interesting results.  Going to grab another O2 sensor this evening and see what happens before posting the results...  Currently have a stock one wire Denso installed and I have another AC one sitting in the box on the shelf.
Texas Buick thing is tomorrow at Little river, so I may a bit late on posting up.  Not going to run the car at the track tomorrow unless I gain a little more confidence in the numbers. 

[Scoobum]

Is this at idle?

The maf is giving you the correct flow numbers for idle?

There are no leaks around the egr valve base and it is sealed (diaphragm wise and plunger) at idle as it should be

Yes this is at idle.  MAF is reading 4. I have a translator with an LT1 MAF.  EGR is blocked off and sealed up tight.  Yes I have an RJC PCV and I have a stock one I could swap in. 


wonder if I have an intermittent translator....

Jason...pull the RJC valve out and pop a stocker in. I've seen BLM counts go through the roof with the RJC valve. My car reads 128 with the RJC valve...and 118 with the stocker.

[good2win22]

Installed the AC O2 sensor and all is well. Actually, better than well. BLM at idle is now 126 while O2's at 790ish. All other untouchable BLM cells at 118.  Going to just tweak the fuel pressure a bit to see if I can get the o2's a tad closer to 780. 





Makes me wonder if I haven't been fighting with an intermittent O2 sensor this whole time....  Oh and as for the translator....  not going to put those funky results up seeing how the AC sensor appears to have remedied things. Thanks for the help fellas!

[Scoobum]

I've wiped a couple of 02 sensors in my car over the years. I noticed the CC's would get slower. Left me stranded twice. 02 sensors are cheap...and I now replace it in the spring and in the middle of the season. Glad all's well. Now get out and make a balls out default setting pass...and get tuning!

[Steve Wood]

glad it was easy and cheap.  Normally,  Denso is about as reliable as they come.  Brad is spot on about the cross counts.

[good2win22]

I did notice the cross counts getting slower but didn't put too much into it.


No tires yet to make an all out pass.  Texas Nats this afternoon. May just put it in the car show and help others. My friend William is coming down from Oklahoma to make some passes.  So I'm gonna be helping him and I'll be picking up a brand new second hand alky kit with 3 bar.  Then I can install Brad's old 60s and alky chip.


 Also get to see Rich as well! Maybe even Charlie!