Bradys build

[Shimy87]

Thanks for the translator info, it's set correctly and the timing wires are not connected. If the maf is AF on the sm at idle it bounces between 6 an 9, O2 is in the 800's. Above idle sounds and runs smooth, if left alone it wants to idle way down then almost stall unless you give it some gas.

[Shimy87]

Ok, started it again, initially idles well, af  between 7-8, O2 about 525. Then when it gets a little heat and computer try's to settle into the low idle is stumbles and wants to die. Used my MAF and switched to the one that came with car ( reset translator for it) exactly the same behavior

[Shimy87]

Also has the techron in the fuel

[nocooler]

Did you reset the iac to get the counts right?

[Shimy87]

How

[nocooler]

http://www.vortexbuicks-etc.com/basics.htm#IAC%20(Idle%20Air%20Control)%20Adjustment


Steve’s got you covered

[Shimy87]

Thank you!! Well know I can get it to idle down a run pretty smooth but if I adjust the IAC anywhere above 2-3 it dies. Where it is now. With tps at .42 warm idle O2 is about 670 and af is 6-8.

[nocooler]

Are the BLMs close or are they off in left field?

[Shimy87]

118 so not terrible

[Steve Wood]

the maf readings are a bit high, but for the moment, put them on the back burner.

The O2s are low for warmed up.  Check the fuel pressure and be sure it reads 43#, if it does, increase the pressure to #46 and see if that brings up the O2s, and pulls the blms up toward 128  a bit more.  Right now, the ecm is adding fuel trying to cover the leaness.

I bought an elky once that someone had put a turbo engine in.  It did not run right and he gave up.  First thing I noticed was that all the intake manifold bolts were loose.  Someone forgot to torque them.  Ran so much better. 

The IAC shows it is idling off the throttleblade rather than thru the IAC passage.  Wonder if the adapter housing is leaking, or if you removed it, it is leaking around the base of the unit?  I have also seen this with a leak somewhere before the throttlebody and also around the egr or base of the plenum.

what is the idle speed?  Sounds like it is idling too high?

[Shimy87]

Thanks, turned up FP to 46 and now smooth idle, set IAC on 25, tps to .44 still BLM of 118. O2 warm idle around 700 to 715.  af at 6

[Steve Wood]

Still a bit lean as shown by the O2s and blm's.  Could be the fuel pressure gauge you are using, or not.

Be sure the steel vacuum lines don't have a hole rusted in them and make sure the pcv valve is working and there is no leak in its line.

[Shimy87]

Different gauge read lower so turn up to 46 on that gauge. Pcv is good. Discovered the vacume line to the map sensor was melted/ crushed closed and another little line to the heating system valve above pass valve cover was broken off at rubber elbow so off to the parts store

[Steve Wood]

My opinion of troubleshootin g cars is mostly grasping at loose straws and searching for needles in a hay stack.  With patience, I usually get there.

[reality]

If you see BLM's ranging between 105 and 127, then the ecm is removing fuel to lean the A/F down to optimize the fuel curve.  If the BLM's are 129-150, then the ECM is adding fuel to  richen the A/F to optimize the curve

From Steve's site, so to bring the blm's up lower the fuel pressure.