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Sedans Volkswagen Jetta Volkswagen Jetta Engine Questions
273 messages, Last post on Dec 03, 2009 at 6:28 PM
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Replying to: ohbaobei (May 20, 2009 6:51 am) My suggestion is that you get a "second opionion". Ask somone else to perform both a "compression test" and a "leakdown test". If the same results come back... I would personally consider NOT fixing the engine.... continue to change the oil and drive it. BTW: I am not convinced that low compression in one cylinder would make the CEL (Check Engine Light) come on. That may be another issue altogether.
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Replying to: bpeebles (May 21, 2009 6:07 pm) the check result is : cylinder #5 has only 90 lbs. but the normal cylinders have 170 lbs. I think there is a big difference! So you think if I go to another shop and have the engine checked and get the same test results, we can still drive this car for a while? meaning the car is still drivable?will not damage the whole engine eventually? what kind of results that might be got from a leak down test?
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Replying to: ohbaobei (May 21, 2009 7:22 pm) Based on that diagnosis, continued driving may, or may not cause further damage. Low compression could be caused by several factors including *) blown head gasket *) carbon deposits built up on valves *) Broken valves *) broken piston ring *) heavilly scored cylinder wall *)..others Virtually all of the "fixes" for these things requires tearing engine apart which is labor-intensive and often costly. To answer your question about a "leakdown test". A "leakdown test" is essentually using a hand-pump to pressureize the cooling-system to normal operating pressure (using a pressure-meter)... then time how long the pressure bleeds off by itself. If the pressure bleeds off too quickly, this often means that the head-gasket is leaking coolant INTERNALLY into one or more of the cylinders. This is somtimes caused by a warped head. If head gasket is internally leaking coolant extensivly.... engine may be difficult to start when cold and blow steam out exhaust when 1st started. BTW: A warped head is often the result of OVERHEATING the engine at some point.... but there are other reasons this may happen too.
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Replying to: bpeebles (May 22, 2009 3:45 pm) the only thing i did is before i drop my car to the shop and have it checked, i changed all the spark plug and add fuel injector cleaner. but the light was still on. so i went to check and was told that one of the cylinder the pressure is only 70lbs but should be 190 lbs. I was planning to have the car check again so i still drive it to work and yesterday the engine light is off.. I have no idea what happened. is it sth good? or very weird? thanks guys!
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Replying to: ohbaobei (May 31, 2009 8:53 am) The new sparkplugs and injector-cleaner may likely have have resolved the problem. (or made it go away for awhile) A CEL will go out by itself if the detected fault is not sensed within 'x' number of "trips" "x" is oftnen defined as "50"... but may vary based on the type of failure detected. A "trip" is defined as starting engine cold and driving until it has warmed up. Perhaps you hit the magic "50 trips" and the CEL went out. (Official documentation for all of this is available if you want details)
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Replying to: bpeebles (May 31, 2009 1:59 pm)
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Replying to: ohbaobei (Jun 01, 2009 6:03 pm) Many autoparts stores (Autozone...etc) will "read the codes" for free. Once you know wich "code" threw the CEL.... let us know what it is.
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Replying to: bpeebles (Jun 03, 2009 5:08 pm) |
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well i just recently bought this jetta from this dealership. within 2 days of getting the car the check engine lite came on and the car started throwing white smoke out of the exhuast. any ideas what it might be i took it to the dealer and they told me it was a sensor gone bad and for the smoke that started happening after they changed out the water pump.
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Replying to: stems (Jun 06, 2009 5:33 pm) |
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