Car is running LEAN! Good fuel pressure (Page 2/4)
gmctyphoon1992 OCT 12, 11:23 PM
If it also means anything the car sometimes loses idle and idles all over the place but it catches itself and smooths out after 10 secs or so the car rarely if ever stalls due to idle problems though
Gall757 OCT 13, 10:11 AM

quote
Originally posted by gmctyphoon1992:

If it also means anything the car sometimes loses idle and idles all over the place but it catches itself and smooths out after 10 secs or so the car rarely if ever stalls due to idle problems though



hummmm. That's interesting. Makes me think you may have a bad ground.
gmctyphoon1992 OCT 13, 10:41 AM

quote
Originally posted by Gall757:


hummmm. That's interesting. Makes me think you may have a bad ground.



I actually just went through an ordeal where I was. blowing control modules due to a broken ground strap on the right cabin firewall which was fixed and I had to fix the one coming from the battery to the frame as well. I also cleaned the c500 connector and got that melted wax gunk out and resealed it

is there another ground strap I can look for to be broken?
Gall757 OCT 13, 11:06 AM
You are going to have corrosion issues where you live.....Hurricanes and salt air. Did you evacuate in the Fiero?

When the ICM goes, there is often another issue like bad spark plug wires or coil.
That 'wax' in the C500 is important....hope you put the same stuff back in.
There is a slim chance that the ECM was damaged too.
cebix OCT 13, 04:35 PM
As for the injectors - you won't know if all cylinders are lean or just some or maybe just one just by ECM data/trouble codes. There is only one oxygen sensor and it pretty much averages all the cylinders output. I would clean the injectors anyway and see how they operate - just my 2 cents.
gmctyphoon1992 OCT 14, 12:48 AM

quote
Originally posted by Gall757:

You are going to have corrosion issues where you live.....Hurricanes and salt air. Did you evacuate in the Fiero?

When the ICM goes, there is often another issue like bad spark plug wires or coil.
That 'wax' in the C500 is important....hope you put the same stuff back in.
There is a slim chance that the ECM was damaged too.



Lol. No luckily the storm hit the upper east coast of Florida not the Deerfield beach, fort Lauderdale area where I was at. Although this storm brought some really nice non humid 80F weather the past few days.

The wax stuff is definitely important but the problem was that the wax due to the high heat melted and was actually preventing some of the pins from getting good contact as well some of the pins were bent. Similar thick corrosion and all weather inhibitor goop was applied in there. I am hoping the ECM wasn't damaged The car ran good after I fixed all the ground problems that was about a year and a half ago. The ignition coil was replaced, the ICM was replaced and the pick up coil was tested good after the ground problems were fixed. New cap, rotor, AC delco plugs, and good quality plug wires were just put on about 7k miles ago.

I also just noticed that after air intake snorkel clamps were tightened down my INT numbers have dropped from like 160 at idle to 128 to 130 at idle and moves around from 90 to 140 during driving but my BLM numbers are still around 135 to 140.
gmctyphoon1992 OCT 14, 12:51 AM

quote
Originally posted by Patrick:

I do recall reading some criticism here of the Bosch O2 sensor not working as well as the AC Delco units with the 2.8 (and possibly 2.5).




I heard that too but at the time my 02 was non functional so I just grabbed what the advance auto parts had at the time. Im guessing a bad idea the new AC Delco 02 sensor is coming friday and im going to replace my fuel filter with a K&N unit at the same time as preventative maintenance item the other one has at least 60k miles on it if not more
gmctyphoon1992 NOV 04, 01:19 PM
Ok so, changed the 02 sensor to a delco unit, New K&N fuel filter, fuel pressure is still good the old filter wasnt really that dirty either.

The car still reads 133 BLM at idle and jumps to 140, 141 when driving. However the short term fuel trim INT reads like 145 to 170 at idle and drops to 128 as soon as i give it gas and when driving the INT never goes above 133

My wide average table is posted below. Anyone have any other suggestions of things I can look for to fix this problem?
edfiero NOV 04, 01:55 PM
Is the car running better, or do you still have the hesitation and sluggishness?
gmctyphoon1992 NOV 04, 02:14 PM
it just got colder in florida for a few days and the car ran alot better but as the outside temperature rose back to 85 degrees the car started to run worse again like it did before. I will also say that when the engine is cold the idle is all over the place and evens out once the car warms up . I am asumming vacuum leaves somewhere I just cannot find it

edit to add: I just drove the car now and it's running peppy and good but It's so intermittent when it doesn't run good though it almost sputters and feels sluggish. the idle was spot on with no variation when I just drove it. I did drive it 2 hours earlier and it was running real sluggish and almost sputtering now it's driving good and I bet when I get back in to drive it later it will drive sluggish again.

[This message has been edited by gmctyphoon1992 (edited 11-04-2016).]