SS/TC No Boost No Codes, ?????
10-08-2009, 06:09 PM
#1
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SS/TC No Boost No Codes, ?????
So I've taken her in twice because of the check engine light and only making 5-6lbs of boost and dying at start up. She also would randomly make boost, sometimes she would make 15ish lbs and run like a champ, other times it was like hitting a brick wall. The first time they cleared up Lean fuel trim, low fuel press, and some other fuel code. She ran strong for about 15mi then it started all over. Second time they reflashed her, and called it good. I picked her up and immediately noticed she was slow as dirt, and only making 5-6ish lbs but not CEL. I pulled back into the dealership. Me and the tech went for a ride not ever dealing with the T/C he thought it was running fine till we talked and I showed him how it was running.
Here is the problem, the car isn't flagging any codes when she doesn't make boost, he also said while they had it hooked up it would flag fuel trim codes, but the readings were well within limits but for some odd reason it would trip the CEL.
So now I'm at home with a free rental as they try to figure it out. I'm just curious as to WTF is going on. Anyone got any ideas as to what it could be? I was thinking maybe the waste gate, but wouldn't that still flag a code?
BTW I'm bone stock.
-Alex
Here is the problem, the car isn't flagging any codes when she doesn't make boost, he also said while they had it hooked up it would flag fuel trim codes, but the readings were well within limits but for some odd reason it would trip the CEL.
So now I'm at home with a free rental as they try to figure it out. I'm just curious as to WTF is going on. Anyone got any ideas as to what it could be? I was thinking maybe the waste gate, but wouldn't that still flag a code?
BTW I'm bone stock.
-Alex
10-10-2009, 03:12 PM
#3
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word from the dealership is that my boost sensor is reading 14lbs when the car isn't running... so they ordered a new sensor and all the piping.
I'm 90% certain it isn't a boost leak though, it would be odd for the car to dump over 10lbs of boost randomly. Sometimes the car runs fine other time its slower than a fat lady in the moto scooter from walmart
-Alex
I'm 90% certain it isn't a boost leak though, it would be odd for the car to dump over 10lbs of boost randomly. Sometimes the car runs fine other time its slower than a fat lady in the moto scooter from walmart
-Alex
10-11-2009, 06:31 PM
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Hey, new here..But had the same problems and just got mine back from the dealership..They found that a flange at the front of the frame damaged the top of the cooler, put a hole in it causing the loss of boost etc..they replaced the intercooler and its been perfect ever since! Might not be the same thing going on with you but just wanted to let you know...
10-12-2009, 01:29 PM
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Hey, new here..But had the same problems and just got mine back from the dealership..They found that a flange at the front of the frame damaged the top of the cooler, put a hole in it causing the loss of boost etc..they replaced the intercooler and its been perfect ever since! Might not be the same thing going on with you but just wanted to let you know...
-alex
10-12-2009, 01:36 PM
#6
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word from the dealership is that my boost sensor is reading 14lbs when the car isn't running... so they ordered a new sensor and all the piping.
I'm 90% certain it isn't a boost leak though, it would be odd for the car to dump over 10lbs of boost randomly. Sometimes the car runs fine other time its slower than a fat lady in the moto scooter from walmart
-Alex
I'm 90% certain it isn't a boost leak though, it would be odd for the car to dump over 10lbs of boost randomly. Sometimes the car runs fine other time its slower than a fat lady in the moto scooter from walmart
-Alex
My gauge is calibrated in Difrential.
But if it's absolute, it SHOULD read 14 - 15 psi with the engine off. As that is normal standard everyday sea level atmospheric pressure. But a diffrential gauge should read 0.
Mine goes -30 to +15 but it says In Hg and PSI.. So I have no idea
if its calibrated to read in PSI or In Hg?
10-12-2009, 07:18 PM
#7
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Wait, are you talking diffrential or Absolut?
My gauge is calibrated in Difrential.
But if it's absolute, it SHOULD read 14 - 15 psi with the engine off. As that is normal standard everyday sea level atmospheric pressure. But a diffrential gauge should read 0.
Mine goes -30 to +15 but it says In Hg and PSI.. So I have no idea
if its calibrated to read in PSI or In Hg?
My gauge is calibrated in Difrential.
But if it's absolute, it SHOULD read 14 - 15 psi with the engine off. As that is normal standard everyday sea level atmospheric pressure. But a diffrential gauge should read 0.
Mine goes -30 to +15 but it says In Hg and PSI.. So I have no idea
if its calibrated to read in PSI or In Hg?
The problem is the dealership has no ******* idea what they are doing. they thought 5lbs of boost was right for the car!
-Alex
09 cobalt ss tc will sometimes boost 15 16 other times 5 6 only mod is down pipe
10-24-2009, 02:59 PM
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If you still have a warranty I'd let them handle it. They had to order new pipeing because they couldn't just order the sensor. But the tech just pop'd off the new sensor and put it in.
-Alex
10-24-2009, 04:10 PM
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well it only happens sometimes like today boostin like **** 6 pounds. lunch control 15 pounds then later on was fine 20 pounds idfk . see its tuned now an in lunch control should see20 22 pounds of boost an regular mode should be 15 16. but now in lunch control only 15 pounds an regular mode 5 mabe 6 pounds boost. guess retune it an take her inn : ( idk tho any help
10-25-2009, 10:51 PM
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Yeah man the dealership replaced the boost sensor before the inlet side of my Intercooler. The sensor went bad and was reading boost when it shouldn't.
If you still have a warranty I'd let them handle it. They had to order new pipeing because they couldn't just order the sensor. But the tech just pop'd off the new sensor and put it in.
-Alex
If you still have a warranty I'd let them handle it. They had to order new pipeing because they couldn't just order the sensor. But the tech just pop'd off the new sensor and put it in.
-Alex
10-26-2009, 04:18 AM
#13
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well it only happens sometimes like today boostin like **** 6 pounds. lunch control 15 pounds then later on was fine 20 pounds idfk . see its tuned now an in lunch control should see20 22 pounds of boost an regular mode should be 15 16. but now in lunch control only 15 pounds an regular mode 5 mabe 6 pounds boost. guess retune it an take her inn : ( idk tho
-Alex
10-26-2009, 08:46 AM
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The car has codes...it just has not popped a SES light yet. If you know someone w/ a code reader I'm sure they could read the stored codes. When our cars detect something is wrong, even without given you the reduced pwr message on the info center, it will go into protection mode to safe the CAT.
10-27-2009, 12:02 AM
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The car has codes...it just has not popped a SES light yet. If you know someone w/ a code reader I'm sure they could read the stored codes. When our cars detect something is wrong, even without given you the reduced pwr message on the info center, it will go into protection mode to safe the CAT.
Last edited by cobaltsslow; 10-27-2009 at 12:02 AM. Reason: Automerged Doublepost
10-27-2009, 05:50 AM
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Since you have the trifecta tune that "roles on corvetts"....maybe you where smart and purchased a data cable...Use the EZTune program to check for codes. I imagine your going to have 1-3 codes in the "pending" section. P101 or P2178 imho
Yea..sucks dealers do not know how YOU messed up YOUR car.
If your trims are rich=Boost Leak
If your trims are lean=Vacum Leak
I just went through this with a blow intercooler side tank
10-27-2009, 01:31 PM
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-Alex
10-27-2009, 03:57 PM
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WOW.....
Since you have the trifecta tune that "roles on corvetts"....maybe you where smart and purchased a data cable...Use the EZTune program to check for codes. I imagine your going to have 1-3 codes in the "pending" section. P101 or P2178 imho
Yea..sucks dealers do not know how YOU messed up YOUR car.
If your trims are rich=Boost Leak
If your trims are lean=Vacum Leak
I just went through this with a blow intercooler side tank
Since you have the trifecta tune that "roles on corvetts"....maybe you where smart and purchased a data cable...Use the EZTune program to check for codes. I imagine your going to have 1-3 codes in the "pending" section. P101 or P2178 imho
Yea..sucks dealers do not know how YOU messed up YOUR car.
If your trims are rich=Boost Leak
If your trims are lean=Vacum Leak
I just went through this with a blow intercooler side tank
should i tell the deler to check the boost sensor between the turbo an innercooler?cuz i dont think they can just do what i ask them cuz they usaly have to contact gm an they tell them what to do. an yeaa i had the recall charge pipe done about 2 months ago an it worked fine but now its havein the same exact problem as your car did so its probly the same problem.hope they get it fixxed..
Last edited by cobaltsslow; 10-27-2009 at 03:57 PM. Reason: Automerged Doublepost
10-27-2009, 05:14 PM
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no only roles on baseline vetts when it runs right at 22 lbs of boost lmao not at 5lbs hahaha an thanks for the in put on that ill let the dealer look for it. but dose have black smoke when i get on it an an is throwing a p2187 dont know what that means an throwin a p0451 evap emission control system pressure sensor range/peformance
should i tell the deler to check the boost sensor between the turbo an innercooler?cuz i dont think they can just do what i ask them cuz they usaly have to contact gm an they tell them what to do. an yeaa i had the recall charge pipe done about 2 months ago an it worked fine but now its havein the same exact problem as your car did so its probly the same problem.hope they get it fixxed..
should i tell the deler to check the boost sensor between the turbo an innercooler?cuz i dont think they can just do what i ask them cuz they usaly have to contact gm an they tell them what to do. an yeaa i had the recall charge pipe done about 2 months ago an it worked fine but now its havein the same exact problem as your car did so its probly the same problem.hope they get it fixxed..
DTC P2187: Fuel Trim System Lean at Idle
I would bet there is a leak somewhere in the charge pipes or intake.
no only roles on baseline vetts when it runs right at 22 lbs of boost lmao not at 5lbs hahaha an thanks for the in put on that ill let the dealer look for it. but dose have black smoke when i get on it an an is throwing a p2187 dont know what that means an throwin a p0451 evap emission control system pressure sensor range/peformance
should i tell the deler to check the boost sensor between the turbo an innercooler?cuz i dont think they can just do what i ask them cuz they usaly have to contact gm an they tell them what to do. an yeaa i had the recall charge pipe done about 2 months ago an it worked fine but now its havein the same exact problem as your car did so its probly the same problem.hope they get it fixxed..
should i tell the deler to check the boost sensor between the turbo an innercooler?cuz i dont think they can just do what i ask them cuz they usaly have to contact gm an they tell them what to do. an yeaa i had the recall charge pipe done about 2 months ago an it worked fine but now its havein the same exact problem as your car did so its probly the same problem.hope they get it fixxed..
DTC P2187: Fuel Trim System Lean at Idle
If not within the specified range, inspect for the following:
With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.
⇒ If the MAP sensor does not indicate the correct barometric pressure, refer to DTC P0106 or DTC P0107 or P0108.
With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be between 2-6 g/s at idle.
⇒ If the MAF sensor parameter is not between 2-6 g/s at idle, refer to DTC P0100, P0102, or P0103 or DTC P0101.
Vacuum hoses for splits, kinks, and improper connections
Insufficient fuel in the tank
Low fuel pressure--Refer to Fuel System Diagnosis.
Ethanol concentration greater than 15 percent--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
Malfunctioning fuel injectors
Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Symptoms - Engine Exhaust.
Vacuum leaks at the intake manifold and the throttle body
Vacuum leaks at the charge air bypass valve solenoid, the charge air bypass valve, and the charge air bypass valve vacuum tank.
The air induction system and the air intake ducts for leaks or for a missing air filter element
A cracked EVAP canister
Evaporative pipes obstructed or leaking
The crankcase ventilation system for leaks--Refer to Crankcase Ventilation System Inspection/Diagnosis.
The HO2S for improper installation and for electrical wires or connectors that may have suffered corrosion, water intrusion, or contacted the exhaust system
Incorrect terminal tension at electrical connectors
Loose, corroded, or mislocated electrical ground connections
The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.
I would bet there is a leak somewhere in the charge pipes or intake.
Last edited by rukkee; 10-27-2009 at 05:14 PM. Reason: Automerged Doublepost
10-29-2009, 11:08 PM
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Same problem Turbo conversion Was the Mass Air sensor
I do have a boost leak. fixed by unpluging the sensor and pluging back in thus reseting the ECU sometimes fixes sometimes not but eventually it stays fixed.
Dealer suggested a Mass Air Sensor Cleaner or replace. Did throw codes and then quite. 102,000 miles on the car with turbo kit.
Dealer suggested a Mass Air Sensor Cleaner or replace. Did throw codes and then quite. 102,000 miles on the car with turbo kit.
10-30-2009, 12:43 AM
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I do have a boost leak. fixed by unpluging the sensor and pluging back in thus reseting the ECU sometimes fixes sometimes not but eventually it stays fixed.
Dealer suggested a Mass Air Sensor Cleaner or replace. Did throw codes and then quite. 102,000 miles on the car with turbo kit.
Dealer suggested a Mass Air Sensor Cleaner or replace. Did throw codes and then quite. 102,000 miles on the car with turbo kit.
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