<currently get code 33 and code 41>
First thing you MUST do, is, disconnect the battery to erase all codes
that were stored in the ECU (about 5 - 10 minutes should do it).
Now, re-connect the battery, and start the car. When/if the SES light
comes back on, (if it doesn't, you're in luck) shut the car off.... and
jumper the A&B terminals with a paper clip. Turn the key in the on
position (do not start the car), and see if this erased any one of the
two stored codes.....
If codes 33 & 41 are still prevalent, lets move on....
<33 ....... excessive air flow indicated>
Nine times out of ten (if the car is idling a little above 1000 RPM in
park (or neutral for sticks), it's a wiring issue. If it's close to 2000
RPM, it's more than likely you're MAF sensor (but not definite
though.... so don't worry just yet).
Although code 36 is not indicated, it would be a good idea to replace
this relay as well, as it too affects the MAF.
Disconnect the battery again, and remove the harness connector
underneath the MAF sensor.
Inspect it thoroughly, and try to trace as far back as you can to see if
any wires are exposed due to age, heat.... or tampering from another
On the fire wall (drivers side), find the MAF Burn Off and the MAF Power
Relay's and their individual connectors.... and inspect them thoroughly
for any tears, rips, and especially for any pulls or tugs (sometimes the
wires can be seen coming out of the connector terminal's.... as these
harnesses come very short in length from the factory).
If the wiring, connectors & terminals check out okay, you'll need to buy
some new Burn Off & Power relay's from any auto store (their only about
$15.00 bucks each..... and, ironically, are the same part number)!
If the above didn't remove the code 33, then it's more than likely the
faulty MAF sensor itself. These are pretty expensive, so find an
aftermarket company who specializes in these (GM Parts will charge you
too much), or simply have you're MAF rebuilt from a specialist (which,
too, is costly, but not as much though).
<41 ....... terminal d3 of the ecm must be properly connected to
engine ground for a v8 engine - disconnect the ecm
c-d connector and probe terminal d3 with a test
light connected to 12-volts. if it comes on, the
terminal connection is faulty>.
This could be tricky, and you'll need to pull the ECM out and inspect
the connections. If the Code 41 didn't go away after you reset the ECU,
it's more than likely the connection at the distributor (electronic
spark control). Again, it's imperative to check all the wires and
connections, as these wires go bad in time, and some get accidentally
cut unexpectedly.... even during a simple tune-up.
<First of all does 41 sound right ????>
You have to give me a symptom, what does the car do differently?
<my electronics says connect 12 volts to ground the light is suppose to
come on and if this is right how do I fix it ????>
Patience is a key factor here. ANY code 33 on the TPI system will
trigger the '"Limp Home Mode" on any GM car, This could also mean that
the Code 33 is causing the Code 41 to appear (but this is honesly a
Once the Code 33 appears, the ECU is set to a very rich mixture..... and
WAY too much timing (this is somthing you can't control.... you can only
eliminate the Code 33, to get the ECU back to it's proper settings).
You're car right now should run very rough, have 'some' spark knock when
you step on it hard..... and shift TERRIBLY, right?
Correct the Code 33 with the info above, then worry about the Code 41
afterward. Believe me, It's probabaly nothing at all..... but not
knowing is what's making it a pain in the @$$.....
<this is from a 88 camaro iroc z28 tuned port injectioned 305>
I had the same car awhile back with a 350, their notorious for these
Codes, believe me!
<I also read on the internet that 41 is for the electronic spark control
now i am confused not that thats a hard thing>
I too was under the impression that is was the Electronic Spark Control
sensor..... but if you're book is telling you the ECU, I would check
both areas just in case, you never know.... :)))