jdog Posted March 15, 2020 Share Posted March 15, 2020 What's the plugs look like? I know you just replaced them but with it running rich it could have fouled them, also check for correct firing order Link to comment Share on other sites More sharing options...
jdog Posted March 15, 2020 Share Posted March 15, 2020 Are you using the injectors from the 98 4.0? Link to comment Share on other sites More sharing options...
dustyniner Posted March 15, 2020 Author Share Posted March 15, 2020 I'll check the plugs shortly.....the injectors I'm using are from a 1998 4.0 my block is a 99 4.0. I got the injectors from a junk yard a few months back, they were in the old.motor and I did have a high idle but not a rough idle. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 15, 2020 Share Posted March 15, 2020 Wrong injectors!!!! Link to comment Share on other sites More sharing options...
dustyniner Posted March 15, 2020 Author Share Posted March 15, 2020 Anyone ever lose brakes in a swap? Developed a super soft pedal, resouvor (sorry for the terrible spelling) is still full of fluid. Link to comment Share on other sites More sharing options...
dustyniner Posted March 15, 2020 Author Share Posted March 15, 2020 Okay, I'll look into finding some renix injectors this week Link to comment Share on other sites More sharing options...
dustyniner Posted March 15, 2020 Author Share Posted March 15, 2020 Previous owner had aftermarket 4 hole injectors and one went bad, I found the first set I could find that had the same pigtail connector and threw the in Link to comment Share on other sites More sharing options...
jdog Posted March 15, 2020 Share Posted March 15, 2020 Did you connect the booster back up, you could have a vacuum leak Link to comment Share on other sites More sharing options...
dustyniner Posted March 18, 2020 Author Share Posted March 18, 2020 So I haven't had money to get injectors yet but the truck was running and driving, had a hesitation at anything under 1/4 pedal but above that it ran fantastic, does anyone have any ideas as to what this is. It backfired real bad a few times and stalled today, now it won't run at all Link to comment Share on other sites More sharing options...
dustyniner Posted March 20, 2020 Author Share Posted March 20, 2020 Put renix injectors in today, still no start, can smell fuel and have spark. Going to test fuel pressure tomorrow. Any ideas at all from anyone? Link to comment Share on other sites More sharing options...
jdog Posted March 22, 2020 Share Posted March 22, 2020 Where do you have spark? What do the plugs look like? Link to comment Share on other sites More sharing options...
dustyniner Posted March 22, 2020 Author Share Posted March 22, 2020 6 hours ago, jdog said: Where do you have spark? What do the plugs look like? Got the spark thing figured out, got worked up and panicky cause my truck was sitting in a $#!&ty neighborhood. The metal tab on the rotor cap broke off.....I checked spark at the coil and got shocked and skipped over the distributor. Link to comment Share on other sites More sharing options...
dustyniner Posted March 22, 2020 Author Share Posted March 22, 2020 Also I put renix injectors in and I still have a rough idle and a hesitation under 1/4 pedal, anything above that and it runs great shift smooth. I checked vacuum at idle I have about 16 (I think it's psi) on the throttle it's about 20, also checked fuel 40 psi holding nicely. Link to comment Share on other sites More sharing options...
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