Anyone here a C4 guy? - Page 3

Avatard · 08-10-2010, 12:31 AM

Quote:

Originally Posted by Adeptus_Minor

Don't you love how her car becomes your job?

My team leader at work has similar issues with one of his sons.

Well, this one's #3. She wrecks this, I'm getting her a bicycle.

Inferno · 08-10-2010, 09:54 AM

I had a '94 Firebird Formula that I pulled and rebuilt the engine. It could be either the Opti, MAF, IAC or the O2 sensors on the headers/manifolds. Maybe the computer, but I have not heard of the computer going it on them.
The LT1 is a tried and true iron block SBC that has been around for decades and is one of the best engines ever built IMO. It is one of the sensors, can be a pain in the ass to find the prob, but should be an easy fix.
Re-Reading your post, check the O2 sensors, sounds like your problem. The other things like A/C...no idea lol

Avatard · 08-18-2010, 11:49 PM

Quote:

Originally Posted by Inferno

Re-Reading your post, check the O2 sensors, sounds like your problem. The other things like A/C...no idea lol

Why would the code scanner not pick that up?

BTW, it seems to get worse when it gets hot. I let it cool a bit, and it restarts feeling much better.

It misfires so fucking bad that the cats start to smoke.

Gas Man · 08-20-2010, 01:30 PM

I'm so sorry man... I'm over here laughing my ass off right now. I'm truely sorry...

Particle Man · 08-20-2010, 03:07 PM

Quote:

Originally Posted by Avatard

Why would the code scanner not pick that up?

BTW, it seems to get worse when it gets hot. I let it cool a bit, and it restarts feeling much better.

It misfires so fucking bad that the cats start to smoke.

Something electrical is swelling with the heat and then contracting when it's cold. If it were older I'd swear it was the distributer cap (had a similar issue with an older car some years back). Check the electrics to feeding the spark plugs...

101lifts2 · 08-21-2010, 01:48 AM

Quote:

Originally Posted by Avatard

Why would the code scanner not pick that up?

BTW, it seems to get worse when it gets hot. I let it cool a bit, and it restarts feeling much better.

It misfires so fucking bad that the cats start to smoke.

I would run the engine with the MAF sensor unplugged (has to be unplugged when ignition is OFF). Let the computer run off of speed density instead of air mass. If the misfire is never apparent, then replace the MAF sensor (they are notorously junk). If it still misfires, then look into the optical spark system, though they usually only fail if they get wet. My 93 Firebird with a 5.7 used to act up (misfire) on occasion come to find out it was the opti spark getting wet.

In earlier years (pre OBD2) the oxygen sensors had a large amount of authority in which would actually make the engine misfire. After OBD2, the calibrations were such that at the 21% +/- fuel correction would set the code, but not cause the engine to miss. You can also unplug the O2 sensors and see if it still misfires.

Avatard · 08-18-2010, 11:13 PM

OK, so I decided to take the C4 out this evening. I had started it up, and for whatever reason, the intermittent clusterfuck issue was on hiatus. Or so I thought.

I go a few miles out to the Hess station, and fill 'er up with some fresh premium.

Should have never switched it off.

When it restarted, it was misfire city. I made it away from the pumps, and pulled over by the dumpster to fuck with it/wait for it to blow over/consider my next move.

My GF drives right past me, in her car. Didn't even see me, even though her headlights had to shine directly on my car, and she passed within 3.5 feet of me. I swear, this woman is sharp as a bowling ball (when I got home later I asked her if she heard a whistling sound in her head when the wind blew; fuck my life).

Mind you, as luck would have it, I left the house with no cell phone...so of course I was kinda screwed. I waited about 20 minutes, and it restarted running at least well enough to drive it (although it sounded like the Beverly Hillbillies truck), and limped home sputtering all the way.

The car gods are out to get me.

I need a new car, and a new GF...

Avatard · 08-21-2010, 01:55 AM

Mine has the ODB2 connector, even though it's a '94 (it must be a late '94, as I think it come online mid-year)

101lifts2 · 08-21-2010, 10:46 PM

Quote:

Originally Posted by Avatard

Mine has the ODB2 connector, even though it's a '94 (it must be a late '94, as I think it come online mid-year)

How many pins is it?

Avatard · 08-21-2010, 11:15 PM

Geez, I dunno...the standard D-shaped connector. Same one on my '99 Expedition...the standard ODB2

I was kinda shocked, and expecting to find the older connector, so it was a relief. I was smart enough to get the to-of-the-line Actron scanner with the complete kit, and ALL the cables, though, because I tend to be a magnet for older cars...

I haven't had the heart to drive it since...in fact, I don't think I'll take it out without someone riding alongside as "backup". When I do, though, I'll unplug the MAF as you suggested, and try it.

08-10-2010, 09:54 AM	#2
Inferno Canyon Carver Join Date: Jul 2009 Location: Savannah, Ga Moto: 08 R6 Posts: 309	I had a '94 Firebird Formula that I pulled and rebuilt the engine. It could be either the Opti, MAF, IAC or the O2 sensors on the headers/manifolds. Maybe the computer, but I have not heard of the computer going it on them. The LT1 is a tried and true iron block SBC that has been around for decades and is one of the best engines ever built IMO. It is one of the sensors, can be a pain in the ass to find the prob, but should be an easy fix. Re-Reading your post, check the O2 sensors, sounds like your problem. The other things like A/C...no idea lol Last edited by Inferno; 08-10-2010 at 09:56 AM..

08-20-2010, 01:30 PM	#4
Gas Man Trip's Assistant Join Date: Feb 2008 Location: Imported from Detroit Moto: 2009 HD Street Classic Posts: 12,149	I'm so sorry man... I'm over here laughing my ass off right now. I'm truely sorry... __________________ -Chris "Why pay somebody else to fuck up your bike?" Run Amsoil Product

08-18-2010, 11:13 PM	#7
Avatard Crotch Rocket Curmudgeon Join Date: Nov 2008 Location: Here to integrity Moto: Li'l red baby Ninja Posts: 7,482	OK, so I decided to take the C4 out this evening. I had started it up, and for whatever reason, the intermittent clusterfuck issue was on hiatus. Or so I thought. I go a few miles out to the Hess station, and fill 'er up with some fresh premium. Should have never switched it off. When it restarted, it was misfire city. I made it away from the pumps, and pulled over by the dumpster to fuck with it/wait for it to blow over/consider my next move. My GF drives right past me, in her car. Didn't even see me, even though her headlights had to shine directly on my car, and she passed within 3.5 feet of me. I swear, this woman is sharp as a bowling ball (when I got home later I asked her if she heard a whistling sound in her head when the wind blew; fuck my life). Mind you, as luck would have it, I left the house with no cell phone...so of course I was kinda screwed. I waited about 20 minutes, and it restarted running at least well enough to drive it (although it sounded like the Beverly Hillbillies truck), and limped home sputtering all the way. The car gods are out to get me. I need a new car, and a new GF... __________________ Insert free thought here.

08-21-2010, 01:55 AM	#8
Avatard Crotch Rocket Curmudgeon Join Date: Nov 2008 Location: Here to integrity Moto: Li'l red baby Ninja Posts: 7,482	Mine has the ODB2 connector, even though it's a '94 (it must be a late '94, as I think it come online mid-year) __________________ Insert free thought here.

08-21-2010, 11:15 PM	#10
Avatard Crotch Rocket Curmudgeon Join Date: Nov 2008 Location: Here to integrity Moto: Li'l red baby Ninja Posts: 7,482	Geez, I dunno...the standard D-shaped connector. Same one on my '99 Expedition...the standard ODB2 I was kinda shocked, and expecting to find the older connector, so it was a relief. I was smart enough to get the to-of-the-line Actron scanner with the complete kit, and ALL the cables, though, because I tend to be a magnet for older cars... I haven't had the heart to drive it since...in fact, I don't think I'll take it out without someone riding alongside as "backup". When I do, though, I'll unplug the MAF as you suggested, and try it. __________________ Insert free thought here.