Callahanj0b Posted May 24, 2023 Share Posted May 24, 2023 (edited) Just joined, first post, hoping to find some help. Friend of mine has a '10 Fusion. A while back it started running rough/dying on him but would usually start right back up and run fine for a bit before doing it again. At first we tried a MAF as that's what the code pointed at. It was happy for about a week. Then the car started doing it again, this time throttle body started acting up and had the appropriate codes, replaced, happy for a week. This thing is being crazy. Temp gauge and A/C going out, intermittent fuel pressure, the pump is not running consistently (it was also replaced diagnosing this) still intermittent. This thing has to be electrical. We've gone so far as using jumper cables and going engine to body, battery to body, battery to engine (obv not the positive, ground only) Like WTH is going on. Codes are currently all over the place, cooling, transmission, fuel, MAF, like anything electrical. We're at, it runs fine for 20 minutes at a time. Hoping someone here has ran into this Edited May 24, 2023 by Callahanj0b 0 Quote Link to comment Share on other sites More sharing options...
robinsone Posted May 31, 2023 Share Posted May 31, 2023 try roughing up the grounding points and see if that helps 0 Quote Link to comment Share on other sites More sharing options...
WKelley Posted May 31, 2023 Share Posted May 31, 2023 Fuel pump has a driver module that can cause problems for the pump. I honestly don't know where it is or how to check it, but my car had random stalling/no start issues even after pump replacement and the shop put the new driver module in and it has been good for some time now. I would pull the connectors from the ECU and see if there are any green crusties anywhere. Has any part of the electrical system gotten wet somehow? You may need a scope to check the network status and see if you can pinpoint a bad module, connector or wire. 0 Quote Link to comment Share on other sites More sharing options...
akirby Posted May 31, 2023 Share Posted May 31, 2023 Check the negative ground to the chassis. 0 Quote Link to comment Share on other sites More sharing options...
Callahanj0b Posted June 1, 2023 Author Share Posted June 1, 2023 Well, looks like there's more to this. He had pressure tests done for compression and coolant. Looks like head is blown between 2 and 3, so we'll be tearing into that, good time to go through all the connections and check for corrosion and will definitely give that fuel pump driver module a look as a blown head still won't cause the fuel pressure to be intermittent. I don't know how well he's maintained this thing but thinking a lot of this is probably neglect. I'll keep the thread updated as we tear more into this but the current plan is to start tear down in beginning of July as he needs time to gather up all the required parts- gaskets, water pump(def change it while we're in there) etc. 0 Quote Link to comment Share on other sites More sharing options...
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