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| Aurora 4.0l / Izuzu 5 speed swap into 88 coupe (Page 90/102) |
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cptsnoopy
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AUG 22, 07:31 PM
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I finished re-installing the cleaned injectors and I also pulled and visually checked the rest of the spark plugs. They all looked ok. I did notice that the even bank of plugs all had a little more carbon than the odd bank but they did not look fouled. I ran the car and it was the same. still missing a couple of cylinders. I did not try pulling plug wires off the coil pack one at a time as I am not sure if that would cause any damage. Does anyone know if that is ok to do with these engines? I did load a base fuel map that Russ544 sent me years ago and it was enough better to actually drive the car. I went and filled up on gas then drove it around for a few miles to get the feel of the suspension and transmission. I am very encouraged and think it will be a really fun car once the engine problems are sorted out. If anyone has any good ideas on diagnosing a couple of dropped cylinders, I am all ears! 
Charlie
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cptsnoopy
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AUG 24, 02:12 AM
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Looks like one of the culprits might be my DIY WB O2 sensor. It appears to be out of calibration and is reading a couple numbers richer than the mixture really is. The other possible issue is that this engine was massaged by the guys at Shelby America for a supercharged Series 1 Roadster. I believe that involves retarding the cam timing. That may be part of the acceleration issue. I'm going to look into that and see if I need to drop the cradle and re-clock the cams.
Charlie
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Bloozberry
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AUG 24, 08:01 AM
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Will
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AUG 24, 08:37 AM
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| quote | Originally posted by cptsnoopy:
Looks like one of the culprits might be my DIY WB O2 sensor. It appears to be out of calibration and is reading a couple numbers richer than the mixture really is. The other possible issue is that this engine was massaged by the guys at Shelby America for a supercharged Series 1 Roadster. I believe that involves retarding the cam timing. That may be part of the acceleration issue. I'm going to look into that and see if I need to drop the cradle and re-clock the cams.
Charlie
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If you have a miss, then the unburned air going out the pipe will cause the O2 to read lean (even if it's a rich misfire). The controller will try to correct by adding fuel to all cylinders until it hits its adjustment limits. If those adjustment limits are wide open (as they might be on an aftermarket controller) then things can be pretty screwed up.
Are there two feedback loops (sensor for each bank), or just one sensor?
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cptsnoopy
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AUG 25, 10:42 PM
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| quote | Originally posted by Will:
If you have a miss, then the unburned air going out the pipe will cause the O2 to read lean (even if it's a rich misfire). The controller will try to correct by adding fuel to all cylinders until it hits its adjustment limits. If those adjustment limits are wide open (as they might be on an aftermarket controller) then things can be pretty screwed up.
Are there two feedback loops (sensor for each bank), or just one sensor? |
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I have two O2 sensors installed but the computer can only use one at a time. I have the wb sensor in the rear bank and the narrow band in the front bank. It's pretty pricy for the new system that can use both sensors but I am seriously considering buying it. Also, I either scratched the tri-pot boot with the file I was using to clearance the engine block or the tri-pot wobbles enough that it rubbed on that boss that sticks out but the passenger side boot opened up enough to let the grease out. This is one of those things that I figured might happen and will have to deal with one way or the other.
Charlie
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Will
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AUG 26, 08:42 AM
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cptsnoopy
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AUG 26, 11:32 PM
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| quote | Originally posted by Will:
You can bolt together an axle setup using production parts with a Type II intermediate shaft.
This post and following show how I built the Type II IMS bracket for my engine: http://www.fiero.nl/forum/F.../000121-18.html#p702 |
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Thank you, I will be considering that as an option. Alan from chrfab said to bump my fuel pressure up to 50psi at idle. I'm curious to see what difference that will make. If it does not help, I am that much closer to dropping the cradle for some moderate mods.
Charlie
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Will
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AUG 27, 08:55 AM
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| quote | Originally posted by cptsnoopy:
Alan from chrfab said to bump my fuel pressure up to 50psi at idle. I'm curious to see what difference that will make. |
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That doesn't make any sense... unless your computer is programmed for the wrong sized injectors.
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cptsnoopy
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AUG 27, 10:45 AM
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| quote | Originally posted by Will:
That doesn't make any sense... unless your computer is programmed for the wrong sized injectors. |
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kinda what I thought. But, willing to give it a try just for the fun of it. If that and a little programming doesn't smooth out the stumbling/lack of power then I'll be more inclined to buy into the newer computer.
Charlie
[This message has been edited by cptsnoopy (edited 09-01-2014).]
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cptsnoopy
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SEP 01, 06:39 PM
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Took a look at using an intermediate shaft and it does not appear feasible with the way I made the motor mounts.
I'm in the process of grinding away more of the boss that sticks out close to the tripot grease boot. I took the bolt out of the knuckle that holds the suspension links and loosened the sway bar link. That way I could separate the tripot joint without having to reset the camber. With the axle moved out and back I should be able to get a tool in there to help with grinding away the boss. I'm hoping to have the tripot grease boot done by tomorrow afternoon. After that's done I'll hook up a fuel pressure gauge and attempt to adjust the pressure regulator to 50psi at idle and see if that helps. I'll also see if it's possible to remove the o2 sensor and put a new one in.
I got some help from a couple generous PFF members and now have the wing ready to install.
If I cannot get a good tune on the engine then I'm thinking I'll invest in the upgraded Holley Dominator computer and stronger valve springs.
Charlie
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