3.5 mystery misfire - Page 7 - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #91 of 96 (permalink) Old 12-07-2012, 03:23 PM
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Could the grind be at the back of the engine where the bolt bashed into things? Turning it over by hand, can you hear the grind at the back of the engine with that inspection cover off?

I envy your temperatures right now - it is 16 degrees outside right now, and this is our high and warmest part of the day... hahah
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post #92 of 96 (permalink) Old 12-28-2012, 07:10 PM Thread Starter
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well finally able to get back to work on her after the holidays, turned out that bolt smashing around bent the starter gasket to drag on the TQ, didnt find out till halfway pulling out the engine but that was the other problem. we were able to take back the motor but just have a credit slip now, oh well ill use it one day.

since the last time i changed the plugs they are now all showing conditions of running lean. with white on all the electrodes, i assume its not a intake MF leak as i have done all the gaskets and its in all cylinders not just one.

i actually plan to get a MT 2500 scanner off ebay with a bunch of connectors and cartages for around 200$, im going to use it on much more then just this car and seems a good deal.
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post #93 of 96 (permalink) Old 01-16-2013, 04:36 PM Thread Starter
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*updated*
well got the scanner in, of course i can only understand half of the data so far but im learnin!

things that stick out to me are

Ign cycle 1 = 4
Ign cycle 2 = 0
Ign cycle 3 = 0
no idea what that means

open/closed loop = closed

Cam sensor will on occasion will flash off then back on this is only when at the misfire, and it does not do it in unison with the cruise control light flash.

Manifold vac = 60 kpa at idle, drops lower at misfire to around 40 then when more trottle is applied, goes to around 70 kpa

left and right ST adap percentage drops to 0 on throttle and then returns on idle
left and right LT adap percentage is -4 to -6 on throttle
no idea what these mean as well

left and right exaust bounced between lean and rich and would only occasionally read center

So i have recently already installed a new dealership cam sensor, i would assume the problem with that lies in the wiring... Manifold vac may be a intake leak however i have also already done both lower and upper intake manifold gaskets and have tested for leaks more then anything else... and finally what are the Left and right LT, and ST adap %?

Last edited by Ruggels; 01-16-2013 at 07:44 PM.
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post #94 of 96 (permalink) Old 01-17-2013, 04:53 PM Thread Starter
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so after enough research and playing around with the tool

learned the Left and right ST, and LT adaptive % are the short term and long term fuel trim, so i reset the LT.

on throttle at misfire the exhausts both read rich, so i would assume its not a manifold leak.

still searching for the problem with cam sensor, none of the up top wires are the problem so far so ill have to do some digging in the back.

i noticed my Barometric was at 100 (kpa) and tool says it should be around 30(B) whats conversions?
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post #95 of 96 (permalink) Old 06-18-2013, 02:53 PM
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You ever get this fixed? I'm dealing with the same running problem with my 2001. It's been doing it for months and then randomly stops for weird intervals. Mostly is caused by BP gas. I don't really want to jsut start replacing components but will if I have to..
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post #96 of 96 (permalink) Old 06-22-2013, 05:37 PM Thread Starter
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Hopefully coming to an end...

the problem was solved, it was caused by a twisted flexplate causing improper timing readings, the car runs off crank sensor (off flywheel) till 2500 rpm when its taken over by the cam sensor, this is what caused it to get better at higher rpms.

if you have a intermittent problem i doubt this is what is happening to you esp if it changed depending on the gas you use, however mine did come slowly over time and was progressively worse so who knows.
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