Need 348 help

I was driving my car last night and after about 1/2 hour it flashed the check engine 1-4 light and lost power on 4 cylinders. It briefly flickered slow down 5-8 as well. I pulled over and shut it off and killed the battery with the cut off switch and waited but it didnt restore power. I made it home in limp mode. I checked the connections on the cat ecu's and thermocouples.They all look like new. I tried unhooking the ecu's but it didnt restore power. I unhooked the battery completely and cleaned the cable connections. I checked the MAF settings and they were both 380 ohms. I had a run in with the cel 1-4 last summer and reset the MAF's and had been ok until last night. Heres where it gets weirder yet: I have 13 volts at my battery terminals but it wont even click at the starter now. The dash lights up(only the 1-4 cel now though??),the interior light,radio etc all work. The headlights are very bright. I dont think that the battery is the problem. I wanted to pull the codes but from what I've read the car has to be running,correct? It appears to have the push buttons on the ecu's and is ready to go that way. So... I have a limp mode problem and dead ignition. Would crank sensors cause this? A bad relay or fuse? I would greatly appreciate any guidance.Thanks for your time.

 

Ok, when I get home tonight I,ll start checking and cleaning grounds. Had a '71 Fiat Spider that benefited greatly by adding a new additional ground strap from motor to frame. Might do that too. Thanks guys-I will post back with results.

 

Ok guys-I'm getting kinda scared now.First I unhooked the battery,then I cleaned every ground I could find in the engine compartment. I replaced the ground strap from the battery to the cut off switch and unhooked and cleaned the cut off connections too.It appears that my car has had a Bosch relay installed going to the starter. Got in and it cranked fine again and started up. It only displays the 1-4 CEL when you turn on the key initially. It is running only on the right side bank when viewed from the rear of the car(1-4 I believe). I let it run until the fans came on. I took off the driver's side ecu panel and held down the button for 5-10 seconds and get nothing. Do those cylinders have to be firing to retrieve codes?I have no tach now as well.Is the tach running off of a feed from 5-8 cylinders? Did i lose my 5-8 Motronic somehow? Anybody have any ideas? Thanks. Jay.

 

I forgot to mention that since its been dead on 5-8 cylinders, the 5-8 check engine light doesnt light up at all when you first turn the key on and its doing an idiot light check. Does this mean that the ecu isnt getting power? I checked the #14 fuse for that side and it was ok. Thanks for the advice Plugzit. I suppose I need to determine whether its no spark or no fuel.When an exhaust ecu finds a fault & kills one bank does it normally do it by stopping fuel?

 

Ok, thanks guys. I did undo and reconnect the ecu plug in but I will take it all the way out and get a better look at it.Has anybody ever had no tach and no cel on 5-8? I have a set of KIA crank sensors coming on Tuesday. They look kinda crappy whether they are bad or not.Is there a relay for the ECU's?

 

I unhooked the ECU for 5-8 and inspected the connectors and its very clean and dry. I poured myself a whiskey(its really hot here tonight),crossed my fingers and swapped the ECU's left to right. When I fired it up I still have no 5-8 light during the light check and it still only runs on 1-4 with no tach. I guess its kind of a moral victory that neither of my ECU's is bad right? I put my inductive timing light to the battery and one of the plug wires on 5-8 and apparently have no spark. I have swapped injection relays from the passenger footwell left to right as well with no results. I am leaning towards swapping coils and igniters from previous advice. Am i missing anything obvious?

 

I have checked over my grounds again. Swapped the igniter and coil packs back and forth & have found nothing on the harness. I have a set of Kia crank sensors coming tomorrow. Mine really look like ****. I am hoping that its my problem. When I sold one of my 911's to buy a Ferrari I was originally looking at 308's,but then I got to looking at how the 348 had Bosch parts that could be swapped back and forth for troubleshooting and how Ferrarichat had a cool bunch of guys that helped each other work on them. Just wanted to say thanks. Does anyone know what air gap the crank sensors need and if the Kia ones need shimmed?

 

I have good grounds, new battery cables & fuses. I have 12 volts at the 5-8 ecu fuse spot.I have swapped relays,Motronic ecu's,ignitors,coil packs. Swapped & unplugged the cat ecu's.I have no 5-8 cylinder bank and no tach . I have literally crumbling crank sensor plug ins -so whether thats what is wrong or not they need to go. I am surprised I have gone as much as I have with the shape they are in. I thought I have seen an air gap of .6 mm somewhere on this site but I cant find it again.Does anybody have anything else to check or know the air gap for the crank sensors? Thanks.

 

Still searching through grounds and connections. What citeria must be met other than having the switch to on to get the 1-4 and 5-8 cels to come on at start up?

 

I have inspected the female contacts and swapped any relay that had to do with the engine(fuel injection and pumps)I pulled out and checked fuses for the pumps and 5-8 ecu. I appear to have 12 volts at the ECU with a meter and good fuse. I am not an expert by any means and will go back to the relay and fuse area if you think I should check something. What fuses and relays exactly do you think would cause my problem. I will look again when I get home. Also- I am not 100% sure where the "bullet connector" ground under the plenum is and I see no twist connector on my left shock tower. Thanks Ernie. I'm hanging on your every word.