1996 dodge van, 5.2 mag. what controls the fuel & timing?
#2401870
11/11/17 01:10 PM
11/11/17 01:10 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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A friend has one & I was wondering what "controls" the fuel/ign so if it acts up we'll know what we might be up against. thank you for your time.
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: RapidRobert]
#2401889
11/11/17 01:48 PM
11/11/17 01:48 PM
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Posts: 8,162 USA
360view
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1996 first year of OBD-II software in PCM. PCM fires ignition coil after getting signal from slots in flexplate rim, then calculating delay. PCM "knows" number one cylinder from sensor in distribultor. Fuel injectors squirt individually for each cylinder, but spray onto backsides of closed intake valve for better atomization. Below 80% throttle, PCM "knows" air to fuel from O2 sensor and keeps modifying two memory counters, one short term and one long term AFF and AAF, to stay near 14.7 to 1 Above 80% throttle PCM goes to very rich air to fuel ( 10.5 to 11) to surpress detonation and to keep catalytic converter ceramic from melting/ cracking. Several "off road" PCM OBD-II software modifiers can write a custom tune. Your friends 1996 still has mostly individual wired up speedo and gauges, but the OBD-II PCM had its first year of twiddling with the pressures inside the automatic 46RE trans. Also first year of EGR valve elimination. http://dodgeram.info/tsb/1996-index.htmHas list of known engine trans issues. Be sure to re-route the ignition wires. Check for blown plenum gasket.
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: 360view]
#2402067
11/11/17 07:29 PM
11/11/17 07:29 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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Thank you for the comprehensive info, much appreciated. thats scary stuff! If it acts up & he wants to keep it we may have to convert it back to a carb/electronic dist/mech fuel pump or a low po electric.
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: maxwedge1]
#2402502
11/12/17 02:20 PM
11/12/17 02:20 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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Jim, when I read 360views' first sentence I became scared straight. Max, I will check for that the next time he stops over after dark. He said it starts/runs/stops/handles good & his only complaint is the mileage (12 iirc) & on my quick inspection nothing jumped out at me as needing attention. thanks guys.
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: RapidRobert]
#2402955
11/13/17 12:26 PM
11/13/17 12:26 PM
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RapidRobert
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I found out it is a '97. I wanted to clean the batt cable terminals but I did not know if you have to jump the terminal to maintain continuity when doing that in order to not mess up the computer?? Also from way back there was something about haveing the injectors cleaned regularly?? is that something that can be sprayed into the throttle body (easy/difficult?) or is that a dealer job?
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: 360view]
#2403181
11/13/17 07:44 PM
11/13/17 07:44 PM
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RapidRobert
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Good info & much appreciated & I think I am going to leave it (all) alone & hope it stays running good for him but he is my best friend & this is a new acquisition of his so I wanted to be proactive if possible.
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: RapidRobert]
#2403334
11/14/17 12:46 AM
11/14/17 12:46 AM
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Grizzly
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12mpg is a touch low if it's highway driving. Plugged catalytic convertor usually biggest cause and next is cleaning both O2 sensors.
Bigger thing to worry about is having fresh ATF4 and filter no later than 60,000 miles. Find out when/if it was done or you'll be under there with Him grunting that sorry-excuse for a transmission out of there. DAMHIK.
Mo' Farts
Moderated by "tbagger".
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: Grizzly]
#2403393
11/14/17 03:08 AM
11/14/17 03:08 AM
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RapidRobert
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12 around town, what trans does it have? I had assumed it was a 727
live every 24 hour block of time like it's your last day on earth
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: RapidRobert]
#2403473
11/14/17 01:18 PM
11/14/17 01:18 PM
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Joined: Aug 2005
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Grizzly
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12 around town is great, there's nothing wrong with it.
360view, would the current ATF cause shudder at idle in gear? I get it on the rare occasion in my truck.
Mo' Farts
Moderated by "tbagger".
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Re: 1996 dodge van, 5.2 mag. what controls the fuel & timing?
[Re: RapidRobert]
#2403693
11/14/17 09:08 PM
11/14/17 09:08 PM
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A727Tflite
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First off for those that read the Tech paper - while it isn't made real clear in the publication - there is a distinct difference in operating systems between Electrohydraulic (EH) versus hydraulic (H) transmissions. Torque converter controls on the EH allow for clutch modulation which controls slippage from near zero to 60 rpm where the H units do not provide slippage by design. As for actual clutch actuation the same thing applies. EH units monitor and control clutch slippage on the gear change and after. H units apply the clutch but do not provide slippage by design. Friction material did not go through any design or material changes during these fluid tests. As a result control systems did not change either. In short what that means is you will not get any issue going from ATF 3 to 4 on the H transmissions at idle or down the road. H units are 30/31TH fwd, 904/998/999, 727, 42/44/46/47/48 red units. RFE units fall under EH as do 41,42,62 FWD trans. For guys using the H rwd units note in the pub that using 4 greatly reduces wear - and on the OD units, there are light years differences betweeen dexron and 4 regarding wear. As for cold fluid viscosity - 4 is the best of the fluids ever used by Chrysler. Reference to "wax". Dennis and Tracey (female) were both sharp cookies. Dennis retired and Tracey left Chrysler for a job at another company - at a great loss to Chrysler.
Last edited by Transman; 11/14/17 09:10 PM.
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