Ok my 4.9 devolpped a miss. Here in Oregon, so I tore it apart and went to install some new parts.

I found that the ground screw inside the cap was stripped. So I am installing a new cap and rotor and can't find out were the round disc with a hole goes. Does it go above the bullet with the sping though it, or below the pullet with the hard part of the shaft going though it.

I just need a link to someplace that will have info on GM HEI Coil in cap stuff.

This is on my 93 Caddy motor in the Fiero.

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85GT 5spd ,93 Eldorado 4.9 Dual O2 Custom Chip, Archie Clutch. Custom Exhaust. MSD Everything 245/50/16's Cant wait for Dyno Time and Track Results. Not Your Average 4.9 Capt Fiero Com --- My Over View Cadero Pics Delta Cam and Allante Intake Soon.

Only the spring sticks through the rubber isolator. Put the center peice in first , then the rubber washer. Use the proper dielectric grease that comes with the cap on the rubber peice (Both Sides).

[This message has been edited by 3084me (edited 03-23-2006).]

Awesome. Found a stripped out ground and am putting it back together as we speak. Will post updates later.

Great.

PS. I love the 4.9 install on your site. I may have some engine mount questions for you. ( can't decide on SBC or 4.9)..

Well the old cap and rotor were damaged. Looks like I bent the tip of the rotor on the last install. I put all the new stuff together fired it up and no change. None at all.

I grabbed my scan tool and it fired up a trouble code, that there was an intermittent Map sensor. Ok so I do a double check and the readings show up as fine, but not too sure.

I run the interchange and the interchange says Fiero and Caddy are not the same. Which really seems strange. I always thought they were. I did some calling around and found a place with an O2 for a caddy for 60 bucks. So I am going to try that and see if that fixes it up.

UGH.

quote Originally posted by Capt Fiero: I run the interchange and the interchange says Fiero and Caddy are not the same. Which really seems strange. I always thought they were. I did some calling around and found a place with an O2 for a caddy for 60 bucks. So I am going to try that and see if that fixes it up.

I assume you mean the MAP's aren't the same.... but anyhow....

Try using one if you've got one. Pretty much all the GM ones (aside from the 2 & 3 bar ones) use the same technique of 0-5V AFAIK and just have different mountings.

4.9L O2 is a two wire unit, the fiero is a one wire but why would you change that for an intermittent MAP sensor code?

On the way to Osage Beach last summer the Finale developed a worsening miss with the 4.9L that was a classic ignition module. I finally found one at an autozone but the car was still running so I ran it (sort of) the rest of the way to OB with a bad miss. Next morning it was a no start. Put in the autozone module and no start. Had the wife bring a GM module on her way and still no start. Put a new coil on and it's run like a champ ever since. I think that by driving it for two hours with a failed/failing ignition module I took out the coil, but I'm not sure. Perhaps a failing coil took out the module. Either way, the two components were both bad (later verified). The autozone one worked and is now in the spare parts group in the car.

John Stricker

PS: Another 4.9 Fiero came alive today in my shop owned by a forum member, but I'll let him post about it.

quote Originally posted by Capt Fiero: Well the old cap and rotor were damaged. Looks like I bent the tip of the rotor on the last install. I put all the new stuff together fired it up and no change. None at all. I grabbed my scan tool and it fired up a trouble code, that there was an intermittent Map sensor. Ok so I do a double check and the readings show up as fine, but not too sure. I run the interchange and the interchange says Fiero and Caddy are not the same. Which really seems strange. I always thought they were. I did some calling around and found a place with an O2 for a caddy for 60 bucks. So I am going to try that and see if that fixes it up. UGH.

[This message has been edited by jstricker (edited 03-23-2006).]

I am sorry yes I meant Map Sensor not O2 sensor. I managed to find a new MAP at a place in Woodburn for 57 USD and am going to pick it up tomorrow morning. I sure hope that fixes it.

I called back to BC and got a hold of DUCK a fellow club member that happens to work in the GM parts department and he said yes the Fiero and the Caddy may plug in together but they are not the same. So I am getting a Caddy one and installing it. I think the car has been running on the Fiero for a while but has failed.

I was getting interment MAP sensor error from the scan tool so................

Well with any luck the car will be back in full action tomorrow afternoon.

Well brand new Caddy specific map sensor, fired up the car and no change at all. *&*&*(&)(*&(*&(**)(*)(

Ok go inside bang head on wall. 400 miles from home and my car throws a PMS like temper tantrum. UGH.

So I have the ecm torn out, the wiring spread apart, hell even removed and re-seated the prom chip. Still the engine fires up and sounds like a 66 beetle motor that is out of tune. Blapty Blapty Blapty.

I am at my wits end, I reach under the dash pull the fuse panel down and my jaw drops, my eyes kinda cringe.

1 fuse is melted into a ball. 2 other fuses are slightly melted and a 3rd has separated from its housing.

I am not sure if it was a chain reaction or what. So I started puling fuses. Starting with the worst looking ones. They seemed to all be fine. They got so hot they melted th plastic but did not "pop" that should not be able to happen. But it did. I will post pics up later.

I started searching through and found a single 5amp fuse that was burnt. So I replaced it and put the ecm back n and hit the key. Hoing for the best. Nur Nur Vroom. Prr Prr Prr Prr Prr. Tap the gas VROOOOM!!!!!! Jump out close the decklid, toss the tools and stuff off the car plunk it into reverse back out to the road, romp it, pin me to the seat, putting both 245's up in smoke. Yep she's fixed.

But what drives me nuts is how it happened in the first place. I know there was a great deal of extra strain on the electrical system on the run down.

New Stereo
350 watt amp
350watt DC- AC inverter running a laptop and other things some items
both cell phone chargers
Radar Detector
Other misc gadgets, (gps and such)

I will post up some pics of the burnt panel but I am going to try and find an online pic of the panel with a diagram of what fuses need what amperage and double check all of them. May just say screw it and replace all of them as obviously I got some faulty ones at some point.

What a day.

quote Originally posted by Capt Fiero: I am going to try and find an online pic of the panel with a diagram of what fuses need what amperage and double check all of them.

Posted this a while back...

https://www.fiero.nl/forum/Forum2/HTML/070657.html

Thank you Mr. Craker.

When I get back to BC I am going to fire all those pics off on a laser printer and save them in the glove box. I went and did it the long way using the OEM Glove Box book to check the size of each fuse rating and made double sure that nothing was over fused and replaced any that looked even remotly heated.

P.S. Took the car out crusing today to Oregon City and stuff. (about 50kms round trip) The car performed flawsly.

Well 2500kms in 2 weeks and the car aside from the fuse performed flawlessly.

I am back in BC and very happy.