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  #16 (permalink)  
Old 07-30-2009, 11:28 AM
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I forgot to add this. The higher you are in altitude, the richer your engine is going to run, with the same amount of fuel used at sea level.

So with your MAP HG's being low, the computer is going to lean out your fuel injection pulse width.

Your complaint is pinging, and this will cause it.

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  #17 (permalink)  
Old 07-30-2009, 11:42 AM
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Another thought Pull it out and look for any carbon build up, in it or the passage way. Check the o'ring if it is mounted into the upper plenum.

You should have a 'linear' EGR valve, and they sometimes will get a little carbon stuck in the pintle. This will set a code for the EGR position though.
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  #18 (permalink)  
Old 07-30-2009, 11:50 AM
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Just got back from Lunch. Here is one more reading that I took, and it did Ping this time. The outside air Temp is now 91 and the humidity is 48%.

It will not ping in the winter, but only when the Temp is in the High 80s or 90s with higher Humidity, if the humidity is down around 20% it will not do the pinging near as bad. Also if I pull my boat with it, it will ping under Load more.

Here is the next set, it did ping when I got on it around 2-3k rpms. So are you stating that maybe my MAP Sensor is bad?

Quote:
JQQUMz5RABSLT TPS(%) 13.7
ENGINE SPD(RPM) 835
CALC LOAD(%) 4.3
MAF(LB/M) 1.44
MAP("HG) 13.0
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 17.0
ST FTRM1(%) -4.7
LT FTRM1(%) 1.6
ST FTRM2(%) 1.6
LT FTRM2(%) 5.5
VEH SPEED(MPH) 21
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.640
ST FTRM11(%) -4.7
O2S12(V) 0.500
O2S21(V) 0.805
ST FTRM21(%) -3.1
O2S22(V) 0.740
PTO STATUS Disen
OBD2 STAT CA
FRAME: -3 TM: -9.5

MIL STATUS Off
ABSLT TPS(%) 14.9
ENGINE SPD(RPM) 827
CALC LOAD(%) 4.7
MAF(LB/M) 1.51
MAP("HG) 13.9
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 19.0
ST FTRM1(%) -3.1
LT FTRM1(%) 1.6
ST FTRM2(%) -0.8
LT FTRM2(%) 5.5
VEH SPEED(MPH) 8
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.795
ST FTRM11(%) -2.3
O2S12(V) 0.535
O2S21(V) 0.310
ST FTRM21(%) 0.0
O2S22(V) 0.765
PTO STATUS Disen
OBD2 STAT CA
FRAME: -2 TM: -6.3

MIL STATUS Off
ABSLT TPS(%) 12.2
ENGINE SPD(RPM) 647
CALC LOAD(%) 3.5
MAF(LB/M) 1.17
MAP("HG) 14.2
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 17.0
ST FTRM1(%) -1.6
LT FTRM1(%) 1.6
ST FTRM2(%) -1.6
LT FTRM2(%) 5.5
VEH SPEED(MPH) 0
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.165
ST FTRM11(%) 0.0
O2S12(V) 0.795
O2S21(V) 0.765
ST FTRM21(%) -2.3
O2S22(V) 0.770
PTO STATUS Disen
OBD2 STAT CA
FRAME: -1 TM: -3.1

MIL STATUS Off
ABSLT TPS(%) 11.8
ENGINE SPD(RPM) 616
CALC LOAD(%) 3.1
MAF(LB/M) 1.14
MAP("HG) 14.5
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 15.0
ST FTRM1(%) 0.0
LT FTRM1(%) 1.6
ST FTRM2(%) 0.0
LT FTRM2(%) 5.5
VEH SPEED(MPH) 0
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.100
ST FTRM11(%) 0.0
O2S12(V) 0.735
O2S21(V) 0.715
ST FTRM21(%) -0.8
O2S22(V) 0.710
PTO STATUS Disen
OBD2 STAT CA
FRAME: 0 TM: 0.0

MIL STATUS Off
ABSLT TPS(%) 11.0
ENGINE SPD(RPM) 609
CALC LOAD(%) 3.1
MAF(LB/M) 1.11
MAP("HG) 14.5
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 16.0
ST FTRM1(%) 0.8
LT FTRM1(%) 1.6
ST FTRM2(%) -0.8
LT FTRM2(%) 5.5
VEH SPEED(MPH) 0
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.760
ST FTRM11(%) 0.0
O2S12(V) 0.710
O2S21(V) 0.805
ST FTRM21(%) 0.0
O2S22(V) 0.685
PTO STATUS Disen
OBD2 STAT CA
FRAME: 1 TM: 3.3

MIL STATUS Off
ABSLT TPS(%) 11.4
ENGINE SPD(RPM) 600
CALC LOAD(%) 3.1
MAF(LB/M) 1.11
MAP("HG) 14.2
COOLANT(F) 203
IAT(F) 156
IGN ADV(DEG) 17.0
ST FTRM1(%) 0.0
LT FTRM1(%) 1.6
ST FTRM2(%) -0.8
LT FTRM2(%) 5.5
VEH SPEED(MPH) 0
FUEL SYS1 CLSD
FUEL SYS2 CLSD
O2S11(V) 0.855
ST FTRM11(%) -7.0
O2S12(V) 0.805
O2S21(V) 0.720
ST FTRM21(%) 0.8
O2S22(V) 0.065
PTO STATUS Disen
OBD2 STAT CA
FRAME: 2 TM: 6.5

MIL STATUS Off
ABSLT TPS(%) 62.7
ENGINE SPD(RPM)1814
CALC LOAD(%) 29.0
MAF(LB/M) 8.85
MAP("HG) 29.2
COOLANT(F) 203
IAT(F) 154
IGN ADV(DEG) 21.5
ST FTRM1(%) 0.0
LT FTRM1(%) 0.8
ST FTRM2(%) 0.0
LT FTRM2(%) 0.0
VEH SPEED(MPH) 18
FUEL SYS1 OPEN1
FUEL SYS2 OPEN1
O2S11(V) 0.875
ST FTRM11(%) 0.0
O2S12(V) 0.905
O2S21(V) 0.905
ST FTRM21(%) 0.0
O2S22(V) 0.895
PTO STATUS Disen
OBD2 STAT CA
FRAME: 3 TM: 9.7

MIL STATUS Off
ABSLT TPS(%) 99.6
ENGINE SPD(RPM)3716
CALC LOAD(%) 62.7
MAF(LB/M) 18.30
MAP("HG) 28.6
COOLANT(F) 203
IAT(F) 153
IGN ADV(DEG) 26.0
ST FTRM1(%) 0.0
LT FTRM1(%) 0.0
ST FTRM2(%) 0.0
LT FTRM2(%) 0.0
VEH SPEED(MPH) 35
FUEL SYS1 OPEN1
FUEL SYS2 OPEN1
O2S11(V) 0.885
ST FTRM11(%) 0.0
O2S12(V)

Thanks,
Bryan
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  #19 (permalink)  
Old 07-30-2009, 11:54 AM
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Thanks for all the help man. Can you tell me where these two sensors would be located that you want me to check? There is a small Vacuum hosed sensor, I know right on top of the Intake Manifold towards the front, passenger side of the Throttle body. Would this be one of the sensors that you are speaking of, for the MAP? Also, give me a hint as to where the EGR sensor would be on this engine, it does not throw any codes at all, I know on other engines I have dealt with its always been towards the back of the engine, on passenger side, is this the same location where it would be on this engine?

Thanks again,
Bryan
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  #20 (permalink)  
Old 07-30-2009, 12:11 PM
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When you take off the top engine cover, the MAP sensor should be on top of the upper plenum. It is a 3 wire connector.

The EGR valve is on the top front of the right side cylinder head. It is a 5 wire 5 wire connector.

When I am bench testing an O'2 sensor, I get them glowing red hot with a propane torch, they usually do not go above 875 Millivolts. Yours are are getting into the 900 MV range with the throttle opened.

Your engine is running too lean I'll bet the MAP sensor has a lot to do with it.
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  #21 (permalink)  
Old 07-30-2009, 12:20 PM
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Is the Map sensor right on the front right corner, sticking up, into the Plenum, and about 2 inches tall? If so this seems a little loose in the plenum. It can wiggle around, I noticed this in the past, but tightned the one bolt that holds it down and it did not seem to make any difference as it was tight. I just let it be.

If so, then what is there to replace on this, just the Oring?
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  #22 (permalink)  
Old 07-30-2009, 12:39 PM
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Quote:
Originally Posted by bry21317
Is the Map sensor right on the front right corner, sticking up, into the Plenum, and about 2 inches tall? If so this seems a little loose in the plenum. It can wiggle around, I noticed this in the past, but tightned the one bolt that holds it down and it did not seem to make any difference as it was tight. I just let it be.

If so, then what is there to replace on this, just the Oring?
Yes. Get the correct one from the dealer.

My self, I would replace the sensor as well. It will include a new o'ring.
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  #23 (permalink)  
Old 07-30-2009, 12:50 PM
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I will replace the Sensor, try to get it on the way home tonight to see what happens.

I think the part that I was referring to, that sticks up on the passenger side, looking at the engine, is the Air Temperature sensor, that I was referring to that is loose.

I will see when I go back out to the truck to see which it is.

Thanks for all your help.

Are there any diagrams that you know of online that show this engine and the parts? I have been searching trying to find some, but have not found any.

Thanks,
Bryan
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  #24 (permalink)  
Old 07-30-2009, 12:56 PM
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Call a dealer, and ask them to FAX you a picture of the upper plenum. See if they will write on there, what each sensor is.
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  #25 (permalink)  
Old 07-30-2009, 01:05 PM
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Quote:
Originally Posted by bry21317
I will replace the Sensor, try to get it on the way home tonight to see what happens.

I think the part that I was referring to, that sticks up on the passenger side, looking at the engine, is the Air Temperature sensor, that I was referring to that is loose.

I will see when I go back out to the truck to see which it is.

Thanks for all your help.

Are there any diagrams that you know of online that show this engine and the parts? I have been searching trying to find some, but have not found any.

Thanks,
Bryan
this is the top of the engine from alldata for your suburban. hope this will help you with identifying things.
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  #26 (permalink)  
Old 07-30-2009, 02:25 PM
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Thanks Guys. I will stop and grab a MAP Sensor on the way home today. I will let you know how it goes later, or tomorrow.

Bryan
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Old 07-30-2009, 05:27 PM
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I got a new MAP sensor, installed it and now its still reading 29.2-29.5. It is now staying closer to 29.5 but still flickering down to 29.2.

I also looked for the EGR valve and do not see this.

Any other ideas? I let the engine idle, and sprayed some carb cleaner around the Intake gasket to see if there were any leaks, but it did not rev up any higher so I am guessing that either was not a valid test or theres no leak.

I have not yet driven the car to see if it will ping, but the temp has dropped so I will wait to see what it does in the morning.

Bryan
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  #28 (permalink)  
Old 07-30-2009, 05:42 PM
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Was the Map HG's staying down in the low 29's at idle, or just with the key on engine off?

With the coolant temp dropping, it is indicating a slightly richer A/F mixture is being applied to the engine from the computer. I'll bet your O'2 readings will drop as well.
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Old 07-30-2009, 08:41 PM
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This was staying in 29's w key on engine off. It was running around 15 with engine in idle. I noticed my water pump is also leaking would that cause anything? Its cooling but the gasket is leaking.

Bryan
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  #30 (permalink)  
Old 07-30-2009, 08:58 PM
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In order to accurately test for a vacuum leak, you will need to unplug the MAP sensor, then clear the code when finished.

Your leaking water pump gasket should not effect all of your sensor readings, only the coolant temp sensor(for the computer). Coolant temp senders do not read steam.
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