Bah, I should have checked the cylinder compression first....Well thanks
for the help you guys have given me already...you saved me from dropping
more money on the wrong parts. I disabled the fuel pump, grounded the
coil, removed all the spark plugs, and hooked a cylinder pressure tester
up to each of the cylinders in turn...very interesting what I discovered:
Cylinder 1 no pressure what-so-ever...nada...zip
Cylinder 2 ~160 psi
Cylinder 3 ~135 psi
Cylinder 4 ~142 psi
Each of the last 3 cylinders at least sounded like there was compression
as I cranked it over...on the first one, there was no sound of
compression...
I have not been able to detect any oil in the radiator or water in the
oil...but maybe I should look harder by releasing some of each into
containers to examine them in more detail....So where is all the
pressure going from cylinder 1? Possible cracked block, or blown
valves? Any idea the best way to proceed from here? Is there a better
way to isolate where the pressure in cylinder 1 is escaping to? Sounds
like I need to do some exploratory surgery. :) Any suggestions where
to start?
Wilbur
david.clement@verizon.net wrote:
> Wilbur,
> Like i mentioned in a previous post you really need to see if the PCM has
> stored any codes. The Autozone's in my area have the scan tools and will do it
> for free.
>
> Dave Clement
> 99 SLT+ CC 4x4
>
> In article <000101c3da34$d12da550$020aa8c0@system>, fasstdak@hotmail.com
> ("Bernd D. Ratsch") writes:
>
>>
>>DRB-III can check it out....but doubt that the PCM went south (haven't seen
>>too many 2.5L PCM's go bad). What exactly is the truck doing (or not doing
>>properly)? Also, check the basics first: engine tune, vacuum leaks,
>>corroded or gunked up sensor connections, etc.
>>
>>- Bernd
>>
>>-----Original Message-----
>>From: owner-dakota-truck@bent.twistedbits.net
>>[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Wilbur
>>Sent: Tuesday, January 13, 2004 6:09 PM
>>To: dakota-truck-moderator@bent.twistedbits.net
>>Subject: Re: DML: replacing timing chain on 1998 dakota 2.5 liter
>>
>>
>>
>>Hmmm...makes me wonder somewhat then if my computer (PCM) has gone
>>south....are there any quick tests for that? I guess I always thought
>>if the PCM was dead...it wouldn't run at all...Again, thanks for the
>>information and suggestions. Have a good evening!
>>
>>Wilbur
>>
>>
>>Wilbur wrote:
>>
>>
>>>Thanks guys....Lots of great info here. I will put forth more
>>>research
>>>before buying any parts...Btw, any preference for timing parts if I do
>>>decide to replace them? Should I go Mopar or can what I get from
>>>Autozone or a similar place be as good?
>>>
>>>Wilbur
>>>
>>>
>>>Bernd D. Ratsch wrote:
>>>
>>>
>>>>There's really no accurate way to check the timing on the Magnum
>>>>engines with conventional tools. Even a scanner will fluctuate on
>>>>ignition timing. The '89 was still in the era where you could check
>>>>timing...but not anymore.
>>>>
>>>>- Bernd
>>>>
>>>>-----Original Message-----
>>>>From: owner-dakota-truck@bent.twistedbits.net
>>>>[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
>>>>david.clement@verizon.net
>>>>Sent: Tuesday, January 13, 2004 6:57 AM
>>>>To: dakota-truck-moderator@bent.twistedbits.net
>>>>Subject: Re: DML: replacing timing chain on 1998 dakota 2.5 liter
>>>>
>>>>
>>>>
>>>>In article <btvts8$emh$1@bent.twistedbits.net>,
>>>>bwgreen@ocean.otr.usm.edu
>>>>(Wilbur) writes:
>>>>
>>>>
>>>>>Hiya Ken,
>>>>>
>>>>>Thanks for replying. :) I got out the trusty timing light and
>>>>>checked it again....I couldn't remember if it had been jumping all
>>>>>over or not and yes, it was bouncing all over....further evidence of
>>>>>timing chain going bad...
>>>>
>>>>
>>>>
>>>>You can't check the timing like that on new computer controlled
>>>>vehicle, the
>>>>jumping is as likely to be the computer doing it's thing. I am not
>>>>sure of
>>>>the procedure for your engine but my 89 Dakota and other DC products I
>>>>have
>>>>you had to pull the plug on the to the temp sensor while the engine is
>>>>runing to put the system into limp home mode. That is the only way you
>>>>can
>>>>determine the base timing setting.
>>>>
>>>>Do not use those results as a basis for changing the timing chain.
>>>>
>>>>Dave Clement
>>>>99 SLT+ CC 4x4
>>>
>>>
This archive was generated by hypermail 2b29 : Sun Feb 01 2004 - 16:29:50 EST