PowerQuest Posted March 30, 2023 Report Share Posted March 30, 2023 Hello everyone! So I recently completed a swap from a 1988 Chrysler Conquest my family had sitting for awhile into my 1986 Dodge Power Ram 50 (Mitsubishi mighty max). I successfully routed the intercooler, wiring, and everything needed from the car. I rebuilt the conquest engine with ARP studs and a new head without jet valves. Im using the flywheel from the quest. The truck starts and runs great. The only things that it's doing that I don't think are good 1. When the truck is under load or high boost (above 5psi) it momentarily hiccups. It's very brief but it does hiccup every 10-15 seconds when under boost. Aside from that I can be cruising on the highway going 70mph without using boost and it runs phenomenal. It's very strange. No hiccups at all until under load. I'm stumped. The injectors are new. Maybe the TPS or Vacuum advance? Any and all help would be appreciated 2. The other thing is when the truck is under boost and I shift a little puff of smoke comes out the exhaust. It's not a head gasket but I feel like the oil catch can isn't properly catching the oil and draining into the pan? I'm worried this will cause and issue for my turbo and intercooler. Sorry for the long post. This is my first time posting on this forum. I stumbled on it while researching my problems with the Quest. Sorry if I'm not posting in the right spot. I'm new to this kind of stuff. Once again, thank you in advance for any help and guidance. Quote Link to comment Share on other sites More sharing options...
obsolete Posted March 30, 2023 Report Share Posted March 30, 2023 Welcome to the forum! What kind of plugs are you using, and how do you have them gapped? Quote Link to comment Share on other sites More sharing options...
PowerQuest Posted March 30, 2023 Author Report Share Posted March 30, 2023 Hello obsolete, I am using NGK plugs and they are gapped to .44 Quote Link to comment Share on other sites More sharing options...
psu_Crash Posted March 31, 2023 Report Share Posted March 31, 2023 Sounds like a vaccum advance issue with the hiccup. Smoke puff at quick decel could be a lot on things. Most of the time it's turbo seals aren't great or possibly valve guides. How to do the plugs look after a good run? Quote Link to comment Share on other sites More sharing options...
PowerQuest Posted March 31, 2023 Author Report Share Posted March 31, 2023 I put brand new NGK plugs and wires and still the same thing. They look okay when I take them out. I can't really get on it until I figure out that hiccup problem though. So I'm thinking of starting with the vacuum advance. Quote Link to comment Share on other sites More sharing options...
tux Posted March 31, 2023 Report Share Posted March 31, 2023 Look also for any vacuum leaks. Quote Link to comment Share on other sites More sharing options...
obsolete Posted April 1, 2023 Report Share Posted April 1, 2023 Try gapping those plugs down to .032" and see if that helps. .044" is too much for these cars in my experience. Quote Link to comment Share on other sites More sharing options...
PowerQuest Posted April 1, 2023 Author Report Share Posted April 1, 2023 Going on vacation for awhile but I will try gapping them down to .032 when I get back. Plus I'll look for vacuum leaks again. Quote Link to comment Share on other sites More sharing options...
Dad Posted April 6, 2023 Report Share Posted April 6, 2023 Vac advance causes a hiccup Won't hurt to replace it since they can cause grief Quote Link to comment Share on other sites More sharing options...
PowerQuest Posted May 2, 2023 Author Report Share Posted May 2, 2023 Hello everyone. I got back from a long international trip. Just wanted to confirm the vacuum advance did indeed fix my hiccup under boost problem. Thank you all for the help! Quote Link to comment Share on other sites More sharing options...
techboy Posted May 2, 2023 Report Share Posted May 2, 2023 (edited) I've been emailing Mike from MKS Motorsport. He is trying to convince Cardone 1 to manufacture Vac Advances again for our car. I hope he's successful b/c I have slight hiccup out of nowhere this season too. I'm pretty sure its the vac advance. Edited May 5, 2023 by techboy Quote Link to comment Share on other sites More sharing options...
PowerQuest Posted May 5, 2023 Author Report Share Posted May 5, 2023 Please keep us posted on that. I would like to get a brand new spare vac advance for the future. Quote Link to comment Share on other sites More sharing options...
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