Edmunds Answers

Voted Best Answer

  • avatar tony78 11/28/09 10:17 pm PST

    Based on the information you provided about the cylinder compression readings,,,,

    There are 3 possibles for these compression readings ( 35,73,105 )

    1. Worn piston rings.
    2. Leaking or bent valves.
    3. Cracked or warped cylinder head.

    You said the engine has 32,000 miles,,,

    Cause and effect.
    1. Worn piston rings, lack of oil, improper engine break-in, cylinder improperly bored and honed, cylinder not bored, just honed - oversize ring / piston set installed ( Typical of an overhauled engine )
    2. Leaking or bent valves, burnt valve face, burnt valve seat, improper break-in, lack of lubrication during startup and operation, excessive load applied, overheating, lugging engine, racing engine, etc.
    Cracked or warped cylinder head, overheating as a primary cause, improper cylinder to head torque rating / tightening sequence, etc

    Further checks would be required by a mechanic to determine if engine is rebuildable, upon inspection to determine if issue is with top or bottom end or both.

    Last, and what i should have noticed first, is that you said " Last year " , you took it to a dealer,,,,Last year was 11 months ago,,,,are we to understand that you have been driving the car in this condition for almost a year ?


Answers

  • tony78 11/28/09 10:17 pm PST

    Based on the information you provided about the cylinder compression readings,,,,

    There are 3 possibles for these compression readings ( 35,73,105 )

    1. Worn piston rings.
    2. Leaking or bent valves.
    3. Cracked or warped cylinder head.

    You said the engine has 32,000 miles,,,

    Cause and effect.
    1. Worn piston rings, lack of oil, improper engine break-in, cylinder improperly bored and honed, cylinder not bored, just honed - oversize ring / piston set installed ( Typical of an overhauled engine )
    2. Leaking or bent valves, burnt valve face, burnt valve seat, improper break-in, lack of lubrication during startup and operation, excessive load applied, overheating, lugging engine, racing engine, etc.
    Cracked or warped cylinder head, overheating as a primary cause, improper cylinder to head torque rating / tightening sequence, etc

    Further checks would be required by a mechanic to determine if engine is rebuildable, upon inspection to determine if issue is with top or bottom end or both.

    Last, and what i should have noticed first, is that you said " Last year " , you took it to a dealer,,,,Last year was 11 months ago,,,,are we to understand that you have been driving the car in this condition for almost a year ?


  • Stever@Edmunds 11/29/09 7:45 pm PST

    You can reply in this thread by clicking the Answer this Question button and that will help keep all the information in one spot. Thanks!

ADVERTISEMENT

Top Engine Hesitation Experts View More

Rank Leader Points
1. zaken1 1360
2. MrShift@Edmunds 840
3. karjunkie 675
4. morin2 100
5. tony78 95
6. texases 90
7. docj 85
ADVERTISEMENT