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- Path: sparky!uunet!olivea!spool.mu.edu!caen!nic.umass.edu!umassd.edu!ulowell!swlvx2!hsd
- From: hsd@swl.msd.ray.com (HERBERT DASILVA)
- Newsgroups: rec.autos.tech
- Subject: Re: Help with engine diagnosis
- Message-ID: <1992Dec18.174608.26143@swlvx2.msd.ray.com>
- Date: 18 Dec 92 17:46:08 GMT
- References: <BzEuA1.1B6@nic.umass.edu> <BzFHr6.18qy@austin.ibm.com>
- Sender: news@swlvx2.msd.ray.com (NEWS USER)
- Distribution: usa
- Organization: Raytheon Company, Tewksbury, MA
- Lines: 50
-
- jnissen@austin.ibm.com () writes:
-
- > Ralph Zottola writes:
-
- >> I need help diagnosing an engine problem. I have a 1987 Chrysler
- >> LeBaron with a 2.2L turbo engine. When the engine is hot, it hesitates
- >> badly with normal acceleration. It is fine cold, at idle hot or cold,
- >> with heavy acceleration, or at speeds above 55mph. It seems as if it
- >> cuts out to shift when rpm is below 2500. It does this in neutral as
- >> well if I race the engine. I had the fuel pump and filter replaced one
- >> month ago. The timing was also done at that time.
- >>
- >> Any suggestions as to where I should begin to look?
- >> --ralph
-
- First thing to do is check the computer for codes. It'll tell you if
- anything that it monitors has any serious problems. If you need
- instructions, mail me.
-
- Automatic transmission then? Fluid up to level? (Check it hot with engine
- idling, in Park)
-
- Sounds like a timing problem or ignition problem...
-
- Who did the timing? A dealer or garage? If garage, did they know they have
- to disconnect a sensor to set the timing correctly?
-
- >Have you checked the throttle position sensor? A partially bad sensor may be
- >giving the computer a bad feedback signal and then your problems show up.
-
- You need a voltmeter to test this. Disconnect the sensor and check the
- resistance values through the full range of pedal travel. Slowly have an
- assistant depress the pedal and look for dead spots in the sensor.
-
- >Is the turbo charger healthy? The bearings making any sound?
-
- It's probably not the turbo, since Jim says the car is fine under heavy
- acceleration.
-
- >Any net advice on a turbo going out?
-
- Turbos HOWL when the bearings start to go. It sounds like you've got a
- company of fire engines under the hood at full throttle. At idle, it may
- sound like there's a large pepper grinder behind the engine. Typically, peak
- boost begins to suffer, then boost lag increases, all the time the howling
- gets louder...
-
- > Jim Nissen jnissen@jnissen.austin.ibm.com
-
- Herb "Mopar Maniac" DaSilva
-