AD codes in a 97?
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Joined: Jun 2007
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AD codes in a 97?
I am changing my glow plugs on my 97 f250. I pulled a valve cover and all the injectors have AD and a long number on them. I thought those are split shot and only work with a split shot computer. Is that the case? How can I tell if my pcm is for split shots? It seems to run fine except for high egts. I have been trying to fix that for a while. Could the wrong injectors (ADs) cause high egts?
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Joined: Apr 2016
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From: Bahstun
high EGT's in stock running mode can be from not enough boost from intake and exhaust leaks
leaf blower on exhaust and spray foamy liquid soap on every flange/ connector
on turbo intake make a adapter from a 3 in Fernco coupling (measure before buying in case different) and a 3 in PVC cap with short piece of pipe in it, drill 1/4 NPT fitting for air chuck, place other Fernco end on turbo and pressurize to 20 psi with a regulator then look for leaks at all connections and intake runners
Weak fuel pump pressure can cause high EGTs as well since boost is reduced from lack of fuel, should never be less than 40 PSI WOT in third gear. A liquid filled gauge and a length of grease gun hose with a few fittings can allow the gauge to be read out side of the hood.
leaf blower on exhaust and spray foamy liquid soap on every flange/ connector
on turbo intake make a adapter from a 3 in Fernco coupling (measure before buying in case different) and a 3 in PVC cap with short piece of pipe in it, drill 1/4 NPT fitting for air chuck, place other Fernco end on turbo and pressurize to 20 psi with a regulator then look for leaks at all connections and intake runners
Weak fuel pump pressure can cause high EGTs as well since boost is reduced from lack of fuel, should never be less than 40 PSI WOT in third gear. A liquid filled gauge and a length of grease gun hose with a few fittings can allow the gauge to be read out side of the hood.
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I don't think it is because I told them it was a 97-believing it only had single shots. I didn't check my pcm when I ordered it: again because I had no reason to believe it had anything other than single shots
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Post Fiend
Joined: Dec 2009
Posts: 15,505
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From: Livoina,La
I'd get the correct tuning and it should run better.
One possible cause for high egt's is the ad codes are 140cc
One possible cause for high egt's is the ad codes are 140cc
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Fleet Mechanic
Joined: Jan 2011
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From: Richland, WA
I'd make sure it's not a Cali truck. If it is, then it's suppose to have split shots and would have the correct tuning for them. Always use the PCM code when ordering tunes; just because it's not in Cali now doesn't mean it wasn't 20 years ago.