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Silver 92 not firing?
We just got back from Palm Springs, stayed at the Indio Elks, 1 of my my neighbor’s there has a 93 Marathon with a 8v92 engine and he had been there for over a week and engine won’t fire.It spins really good but it doesn’t even sputter. The owner had some health problems so I went over there a couple of times and checked it out, Never even seen a silver 92 before, I called Dick Warren and he told me to check the switch in the rear for rear starting,Inside rear electrical panel there is a clear relay that clicks when you put switch in rear start position and a yellow wire at botton has 24v when switch is up has power coming out on top side of relay so that tells me switch is OK?. Funny thing when it was spinning I sprayed some WD40 in the little flip up after turbo and nothing. I jumped fluid level sensor no go,at this point I was worthless in trying to figure it out. At this time 3 of his friends came over and the one guy seemed to know this engine. There was a aux fuel pump wired in line so he cracked a couple of lines and pumped any air out No Go. They tried spraying starting fluid in that flip up a couple of times No Go. I thought on a diesel spraying starting fluid in and cranking it,It might at least sputter. The 1 guy said if the DDEC 2? was bad it would block it from getting fuel and starting fluid ?? Any thoughts??
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16 Replies
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Once it spins, and is known to be able to push fuel, if it will not start it is related to the electrons. The low hanging fruit is a list of easily checked things like the rear front-off-rear switch, the run relay, and power to and from the ECM CBs, #19,20, 21. If the ECM has power, everything else checks OK, it is probably the ECM.
Get a reader on it. The DDEC opens the injectors so if fuel is flowing it will just make a loop to the return line.
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Should mention there are sensors that will prevent the engine from running so they need to be checked also.
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check water level in rad tank. if it is low no go..I had a 8v92. you can jump water level sensor with paper clip. Also the ddec is seperate fused most of time close to actual starting battery. Tube type. can corrode . Also ddec 2 needs min of 11.5 volts to dddec work. The Wanderlodge site has good infor on 8-v92 including wiring and troubleshooting.
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one low battery is set can kill ddec.
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He had plenty of volts 28v I jumped the fluid sensor, I guess they will figure it out.
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I didn’t think it had a port to plug in a reader??
Jeff and Lindsay
91 Marathon XL -
Art,
I had that happen a few years back. It turned over fast and strong and the voltage tested good. I couldnt find the plug for the reader either. I am told there has to be one somewhere.
Since the chassis batteries were six years old i decided to change them out. It fired right up after i did that. One of them tested to have a shorted cell. As has been discussed the ddec seems to be kind of fussy on having clean power.
If you happen to find out where his diagnostic plug is please post that info. Good luck.
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Duplicate post deleted.
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try under dash about where your right knee would be… or side console toward rear on side. Voltage can drop to ddec during cranking load. Just weigh all options and hope you find it…
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When you trn on the switch check to see if check engine and stop engine come on and then go off. If the ecm isn’t getting both lights the ecm isn’t getting voltage.
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That was 1st thing I checked all dash lights check engine lights come on and then off
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The DDEC plug in is located up front under the drivers seat access from outside bottom door should be right above steering box.
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Thank’s I will let them Know
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So on a 8V92 has a solenoid that shuts off the fuel when you shut it off, controlled by DDEC 2, On our series 60 they don’t have a fuel solenoid shut off?? Does it happen very often that the DDEC3 fails and engine is dead?? If a series 60 spins but doesn’t fire, What do we check for?? I have a Scan Gauge 2 that shows volts on DDEC what else??
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bad rear/front start switch on side of rear junction box–get old and corroded. Just another to add to list. wire number 439 should have 12V to it when front switch is on. tatooed on side of wire about every 6 inches..
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