When i start my car after it has been sitting over night the car will start RPM's jump a little over idle (normal) and then the car will bog out, even if i try to add throttle to keep RPM's up it will still bog out. Sometimes it will take 3 or 4 tries before the car will stay on and even when it finally stays on idle is not constant it will rise and fall and then eventually it will stabilize. I know of one other guy who has this same problem and i have had my car in for them to look at and they can't figure it out and his car has been in the shop about a week and the service department can't figure it out. Any thoughts or anyone else had this problem and got it fixed?

 

guy who has had his car in the shop for just over a week is a champ

oh wait thats me


BUMP FOR THIS F'N PROBLEM

 

Service Information 2007 Chevrolet Cobalt | Cobalt, G5 (VIN A) Service Manual | Engine | Engine Cooling | Repair Instructions | Document ID: 2240936
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#PIP3146C: Crank No Start Rough Idle Or Misfire When Cold Due To Compression Loss - keywords cylinder DTC engine hard head lifter loss low MIL miss no noise nostart P0300 rattle repeat rough run start tick valve - (Feb 26, 2009)


Subject: Crank No Start Rough Idle or Misfire when Cold due to Compression Loss

Models: 2000-2009 All Passenger Cars with Gasoline Engines

2000-2009 All Light Duty Trucks with Gasoline Engines
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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Crank no start when cold. The engine may crank over very fast, as if there is low/no compression. It may also run rough for up to 5 minutes after starting the engine and may exhibit a P0300 DTC too. This may be caused by sticking valves due to fuel contamination. When the engine is cold, the compression on multiple cylinders may be at 0 PSI. The engine also may pop through the intake or exhaust while cranking and the spark plugs may be fuel fouled when inspected. Some engines may also experience valve damage or cam followers that are out of position as a result of this.

This condition will normally occur in specific areas of the country for a period of time and then it will no longer occur after the suspect fuel source has been consumed in that area of the country.

This PI pertains to all engine sizes and RPO's listed below:

Sizes:
1.0 1.3 1.4 1.6 1.8 1.9 2.0 2.2 2.4 2.5 2.6 3.0 3.1 3.2 3.4 3.5 3.6 3.8 4.0 4.1 4.2 4.3 4.6 4.8 5.0 5.3 5.7 6.0 7.4 8.1

RPOs:
L01 L18 L24 L26 L29 L30 L31 L32 L34 L35 L36 L37 L42 L43 L47 L52 L59 L61 L65 L67 L81 L95 LA1 LA3 LB8 LC3 LD8 LD9 LE8 LF6 LG3 LG8 LH2 LH3 LK5 LL0 LL8 LLT LM4 LM7 LN2 LNK LP2 LQ4 LQ9 LR4 LSJ LS1 LS6 LU3 LV6 LW9 LX5 LX9 LY8 LY7 LY9

Recommendation/Instructions:
If the SI Diagnosis leads to a compression loss due to sticking valves, the following information may help:

If there is no sign of valve damage or cam followers that are out of place, perform the following procedure to free up sticking valves and to prevent the valves from sticking again. If valve damage is present or if there are cam followers that are out of place, perform engine mechanical repairs as necessary to correct the concern and then perform the procedure below to prevent the valves from sticking again.

Clean the fuel system by following the applicable "Fuel System Cleaning" procedure outlined in SI.
Add fuel injector cleaner "GM Fuel System Treatment PLUS, P/N 88861011 (for U.S. ACDelcoŽ, use 88861013) (in Canada, 88861012)"... see bulletin # 05-00-89-078A, to the fuel tank in the approved quantities.
Refill the fuel tank using fuel from a high volume, high quality filling station.
Clean the induction system using GM Top Engine Cleaner. Follow the directions on the can but DO NOT force the engine to stall since forcing the engine to stall with liquid Top Engine Cleaner could cause the engine to hydro-lock.
Advise the customer to change fuel filling stations. They should use fuel from only high volume, high quality filling stations or they should use a Top Tier Detergent Gasoline if available. See 04-06-04-047F (U.S.) or 05-06-04-022B (Canada) for details regarding Top Tier Detergent Gasolines.
Note: If the condition is not eliminated chemically, it may be necessary to remove the valves to manually clean the stems.

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You both are in the same area (Vancouver)

 

good find ..i'll show this to the service manager before i leave for my trip i want my car back for the last week that im here

UPDATE TO TSB ABOVE ^ = gave to service manager he looked at paper work and said they already saw that TSB so no go on that one..they're sending info from my car and i believe lazers as well to GM Engineering see if they can make a fix not just for our cars but for others too..this might end up as a service bulliten of its own.. (yay me and lazer lol)

 

already showed it to them and it is definately not it.

 

well i know its weird but my car starts fine every morning now but im sure it will happen again.

 

AC on or off at the time? Clean your throttle body

 

all accessories were off the shop foreman seem to think it has something to do with the tune from GM maybe air fuel ratio off or something like that?

 

ya they were thinking it was a stage 2 tune problem..and yea throttle body and everything have been cleaned etc..when george handed me back my car he said that the new spark plugs will help for a while but it'll just end up doing it again