Can someone help me with a OBDII code here? - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 4th, 06, 04:12 PM Thread Starter
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Unhappy Can someone help me with a OBDII code here?

I was towing a truck with my trailer today and the 99 silverado fell on it's a*s while pulling a hill. I've got 2 codes.
PO300, which is multiple cylinder mis-fire.
PO463, which says, Fuel level sensor circuit high input.
Question is: What is the 463 sensor, or? What does "high input" mean. And how do I resolve the problem.
I'm sure the 300 code is there because of the 463.
The truck is stumbling & misfiring, pinging under any kind of load, and got really warm when it started. 235 degrees! Probably due to a lean condition, but????
Where do I go from here?
I had just filled it with gas about 7 miles prior to this.
Bad fuel? I'm not thinking so but?

Oh yeah, 6.0 with Hypertech program, but only changed tire size for speedometer, all other settings are stock. 87 octane. Automatic, 4x4

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #2 of 11 (permalink) Old Mar 4th, 06, 05:43 PM
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Re: Can someone help me with a OBDII code here?

My 96 Jimmy Service Manual says:
"The fuel level sensor is an important input to the VCM for the enhanced Evaporative System Diagnostic. The VCM needs the fuel level information in order to know the volume of the fuel in the tank. The fuel level affects the rate of change in the air pressure in the evaporative system. Several of the enhanced evaporative system diagnostic sub-test are dependant upon correct fuel level information. The diagnostic will not run when the tank is greater than 85% or less than 15% full. This sensor signal disables the misfire when the fuel levels are less than 15%. This DTC is a type D DTC.

The following conditions set the DTC:
The fuel tank level slosh test is completed.
The fuel level main test is completed.
The fuel tank level data valid
The fuel level signal voltage is greater than 4.6 volts for 20 seconds.

The VCM will not turn on the MIL.

Test consists of
1. turn the ignition on
2. record the fuel gauge reading
3. turn the ignition off
4. disconnect the VCM black connector.
5. turn the ignition on.

Did the fuel gauge reading change? Yes = replace VCM N0=go to engine electrical for fuel gauge diagnosis.

Sounds like it only affects the guage, and the evaporative testing, shouldn't affect the way the truck runs. Must be the 300 code, and bad gas. Hopefully the station didn't get diesel fuel in the gas tanks.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #3 of 11 (permalink) Old Mar 4th, 06, 05:48 PM
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Re: Can someone help me with a OBDII code here?

the PO463 is the fuel level senser in the gas tank has gone bad , sounds like you need a fuel pump , i put 5 to 10 chevy truck fuel pumps i a week theses pumps come with the fuel tank senser they are not cheap you have to pull the tank out to repair it
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post #4 of 11 (permalink) Old Mar 4th, 06, 06:06 PM Thread Starter
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Re: Can someone help me with a OBDII code here?

Yep! My fuel gage has been erratic bouncing from full to completely empty. It can read empty right after I fill it. Lately, it's been dropping to E and then slowly raising up to full.
But It's been doing this for about a year. It does seem to be doing it more often now though. The truck can be sitting at an idle and the gage will flop back & forth a couple times.

Mark, what does VCM mean? Vehicle control module? That's my guess.
And Mil? no clue on that one.


So, maybe the misfire is related??
I had to change a pump in my 99 GMC 1 time. That sucked. The truck would run but then just die out, stumble and then run good. It was weird.
That was a 5.7 Vortech. This one is different in alot of ways even though they are the same years. This one a 6.0 with the coils on the valve covers.

Thanks for the input. Anymore?

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #5 of 11 (permalink) Old Mar 4th, 06, 06:43 PM
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Re: Can someone help me with a OBDII code here?

Vehicle Control Module. The ECM (engine control module) is a part of this., on my truck it sits on top of the passenger side inner fender, looks like a rectangle about 1.5" high and 10" square.

The MIL is the Malfunction Illumination Lamp, ie the Check Engine Light.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #6 of 11 (permalink) Old Mar 4th, 06, 09:03 PM Thread Starter
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Re: Can someone help me with a OBDII code here?

Thanks. Well, I went & checked the spark at the coils. I have a yellow spark, but understand I should have a blue spark. Possibly low voltage to the coils. Maybe. I'm going to have a shop hook up a pressure gage at the fuel rails & see if pressure is good. I'm suspecting maybe low fuel pressure, since the "pinging" (detonation) is extreme under load or hard accelerating. Too lean?
At least I have somewhere to go now for a diagnosis.
I changed the fuel filter last Nov. Got ALOT of crap out filter. Black crap. Possible tank has lots of contamination. Maybe so bad fuel pump screen is getting plugged as well.
I'm thinking even if I have voltage problem, dropping the tank may have to happen as well. I found out the 463 code, being High input is too much voltage to fuel sending unit.

Could be a combination of things here.
One thing is for damm sure, it's not going to be cheap!

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #7 of 11 (permalink) Old Mar 5th, 06, 06:03 AM
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Re: Can someone help me with a OBDII code here?

since the "pinging" (detonation) is extreme under load or hard accelerating. Too lean?

Do you use a airfilter that has to be oiled, alot of times these will cause buildup on the mass airflow sensor wires and cause lean conditions, see this happen all the time. Remove the airflow sensor, take it apart and spray the small wires inside with electrical contact cleaner.
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post #8 of 11 (permalink) Old Mar 5th, 06, 10:26 AM Thread Starter
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Re: Can someone help me with a OBDII code here?

I don't use a oiled filter but removing airflow sensor & cleaning it can't hurt for sure.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #9 of 11 (permalink) Old Mar 5th, 06, 05:59 PM
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Re: Can someone help me with a OBDII code here?

Temprarily ground the tank to another well grounded location and see if the guage reading stabilizes. Could be a bad ground in common with guage and pump. Good diagnostic info in this thread.

Dave
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post #10 of 11 (permalink) Old Mar 5th, 06, 06:16 PM
 
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Re: Can someone help me with a OBDII code here?

Check the connector where the fuel pump harness plugs into the main harness at the tank also, been having lots of problems with those lately. GM has a recall on those connectors but I think it is only on the 97-98 model years but not positive of that.

Bill
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post #11 of 11 (permalink) Old Mar 5th, 06, 07:55 PM Thread Starter
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Re: Can someone help me with a OBDII code here?

Quote:
Originally Posted by BowtieBill
Check the connector where the fuel pump harness plugs into the main harness at the tank also, been having lots of problems with those lately.
Bill

Will do. 1 problem though. It hasn't stopped snowing since 3 AM, there's 7" right now and not sure what we're going to wake up too.
Need to get'er to the shop tomorrow somehow.
It's suppose to snow for the next 6 days!!!

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
stevo camaro is offline  
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