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This new-fangled technology has me scratching my head alot!  :oops:


My 1998 Chevy pu with 5.7 Vortec had the "check engine" light activate recently.  .....I used a code reader to retrieve the code for a misfire of #3 cylinder.  ....I cleared the code, and so far it has not re-appeared.

What I am confused about is, HOW does the computer know a cylinder has mis-fired, and WHICH cylinder mis-fired?  ....What sensors provide the info needed by the computer to detect the misfire, and pinpoint the offending cylinder?

I'm embarrassed to admit that I'm not up to date on late model technology, but I know some of you work on this stuff every day.

I tried to think these questions through, but I've failed to come up with a logical scenario.

Thanks in advance to anyone who will attempt to educate this dummy! :oops:  :oops:  :oops:

Short explanation is like this:
A misfire will cause a change in crankshaft speed
As the crank sensor and PCM are timing the crankshaft , the PCM can determine if the speed intervals are excessive.
It will time each speed interval and compare it with the previous one.
There is also as certain amount of crankshaft speed change on acceleration and decel. but that would be programmed into the PCM
The PCM will then determine what cylinder it is and set the appropriate code.
Probably one of the best scan tool parameters we have now.
Makes things much easier.
Jeff

No just R&R the lines from the adapter and install plugs.
I believe they're 1/2 pipe plug but you can take one of the quick connectors to the parts store to match them up.
I usually pull both lines off at the filter and then the top line on the rad.
Then let the cooler drain over night, cleaner this way.
Then insert both lines into a dumpster and never leak again
Jeff

honestly Bruce if I had a full size truck with a cooler I'd scrap the lines and change the oil filter adapter over to a regular filter adapter if it's a 2WD.
For a 4WD you have to plug off the adapter with 2 pipe plugs
I look at it this way, Hi Perf engines lasted for years without coolers and survived
What changed?
My 2 cents
Jeff

They've tried all types of designs changes and they still leak.
How they can make a PS line hold 1400Psi and not a oil line that holds 40 Psi is beyond me.
For awhile GM was having us cut the crimps off,disassembling them, cleaning and reassembling using a special type of hose clamp.
While I never had a comeback with them I was always wary of my oil pressure being held with a hose clamp.
I'd buy new ones KEEP the bill and mark your calender for 1 year less a day and recheck them before the parts warranty was up.
Jeff

I want to install a rear-view mirror with a compass in my '48. I have one that came out of a late 90's early 00's Olds. Can anybody tell me how to wire this thing?

It has 5 wires:

Pink/black
Pink
Gray
Green
Black/White

I want to try mounting the compass thingie up above the windshield moudling out of sight. If I get it to work then I'll try to get one with a temp sensor too.

This is from a 99 Olds Eighty Eight
Pin1-Pink/Black is a ignition feed from the fuse block
Pin 3-Light Green is also a ignition feed from the fuse block in reverse only.
Pin 2-Black/White is the ground.
Pin4&5- grey and pink, go to the LH outside mirror to control the dimming on that mirror also.
So you likely won't have to worry about pins 4&5.
Pin 3 is for lightening the mirror in reverse so you can see behind you.
If you don't care about that you don't need to use it either.
Jeff

Never seen a successful conversion.  But if the conversion was successful I guess I would not know it if I saw it.

I'm thinking the front doors on a four door 32 are narrower than those on a 2 door.  And then there is the rear quarter window issue.  The "C" pillar would have to be cut away to make a 2 door style side window.  I'd be concerned about strength in that area.

I have seen Model A and 32 four doors converted to very nice stretched pickup cabs.  Requires some serious metal forming below the quarter and rear windows.   But it is infinately more doable than a four door to two door conversion.

I know the doors would have to be stretched but I figure you could use the rear door as a filler for the front door. I kow it'd be a big job but 32 2 door sedans aren't that common

I've got a pretty good opprtunity to pick up a 32 sedan that was hotrodded back in the 60's, problem is it's a 4 door and thats not for me.
Anyone ever convert one to a 2 door sedan?
I know it'd be a lot of work but would it be worth it?
Thanks
Jeff

If I had a Lumina manual at home I could tell you exactly what you should see by tracing the schematic but I can't do that till tomorrow.
However with GM flow charts when they say lighted they mean lighted.
If the test light only glows that is assumed to be off.
Code 42 should be a EST failure right?
EST codes have always been a * to diagnose, specially on 3.1s and 2.8s
Almost always a module though, rarely a ECM.
If you need more info I can check a manual at work tomorrow
Jeff

Went on a cruise today of about 125 miles.  A little more than half way I developed a pronounced miss.  Pulled wires until I found the dead cylinder.  #5.  Pulled the plug and it was wet.  Limped home and did a compression check and it came up ZERO on #5.  Pulled the valve cover and the push rod had punched a hole right through the rocker arm.

Anyone got a guess as to what happened or why? Chevy SB.

Not the first time i've seen that, the higher mileage vortecs do it quite a bit.
Just wear is the only explanation I've got.
Several that I've fixed I've replaced all 16, I imagine a performance cam or higher than stock valve spring tension would cause this problem.
All the ones we get are stock though
Jeff

I've done several here at the dealership Tony and I've yet to see a bent valve in one.
I don't think they are a free running engine but you never know.
Gotta remember GM built them with a plastic timing gear so they did know what was bound to happen with them.
Jeff

wow, really I never though of that.

I'd like to do the starter on my roadster but I'm not sure what the process would do to the magnetic core.
It's a gear reduction vortec one with the magnaquench middle piece.
The magnets are part of the middle housing and not removable.
Any ideas?
Thanks
Jeff

anyone know what the story is with that guy?
I can't see you ever making back your money running a museum in Co.
I was sure I'd heard one of the commentators say that he drove a Enzo for fun.
Too much money too little brain
Jeff

Here's the pin locations and functions Choco.
The colours don't correspond to your O2 but the pin locations and functions are the same if it's a flat 4 pin conn. or a square 4 pin conn.
pin A- low signal ,tan
pin B - high signal, purple
pin C- Ground , black
pin D - ignition 12 volts pink

i've been told the sears canada craftsman hand tools are made in japan. is this true?

Not sure of where they are built but I find them to be pretty crappy.
I wouldn't buy them for work and i'm always suprised when i see U.S. members talking about buying Craftsman all the time.
I'll go to Canadian Tire before I'd go to Sears and as any true Canadian will tell ya thats not a good thing.
Jeff