Messages

1

General Buick Tech / Re: New start-up help

« on: January 28 2018, 05:16:54 PM »

Will do. Everything has its own ground. (plastic car) Doesn't mean I didn't miss one. 
 I think the alt. is showing its age. Should have around 14.5v at idle..13.8 its not charging the battery enough between start-ups.

When you get a BLM reading with the engine warmed up post it. Idle fuel for the Z06 can be adjusted for lean/rich via numbers 7 and 8.

Ok heres the latest#s cold & hot
o2-800      761
af-05          05
l8-38          34
bat-14.3    14.0
int-128      128
bl-128       118
mph
clt-120      164
ats-67       108
r-850         950
tps-44         44
iac-175        00
New NGK UR5s set @.30
A little hard to start today. Would start and stall till I opened the throttle some to get her to stay running. Then ran rough for a few secs.Then idled ok as I slowly let off the throttle.
ECM ground is off the frame and shows almost no difference from its bonding point to the frame.
 I did notice as the engine warmed up the voltage from the Alt. went down some. Like .5-1.5 volt which by the time it gets to the battery is about 13.5 and less when the fan starts.

2

General Buick Tech / Re: New start-up help

« on: January 27 2018, 09:47:28 PM »

Will do. Everything has its own ground. (plastic car) Doesn't mean I didn't miss one. 
 I think the alt. is showing its age. Should have around 14.5v at idle..13.8 its not charging the battery enough between start-ups.

3

General Buick Tech / Re: New start-up help

« on: January 27 2018, 04:37:57 PM »

Stars and runs MUCH better! ('magin that?)
 Still need to give it a bit of throttle to start but not running rich. Idles smooth. But now I have to chase down an electrical gremlin that I didn't have before I pulled the dash. When the fan starts it pulls the voltage down so far the car almost stops. And the voltage seems to not be steady on the Scanmaster. Bouncing around from 12.1 -13.8 at a steady idle. Gotta be a ground as the alt puts out 13.8

4

General Buick Tech / Re: New start-up help

« on: January 24 2018, 05:35:21 PM »

Dip switches for Erics chip are on on on off. Z06 MAF requires the base knob to be set to 6. A special 3 to 5 pin wire is required as well...availab le from FT. Same setup I have on my POS.

Well CRAP! I had the base set @ 0! Now I have to hurry and finish the dash wiring so I can check whether that's the problem.  I hope it's that easy.
 Thanks for making me double (really triple) check that setting.

5

General Buick Tech / Re: New start-up help

« on: January 23 2018, 09:55:56 PM »

As stated, the maf should read 3 with the key on, engine off.

Your signature is saying the car has a translator which must have a late model LT or LS maf.

Could you please clarify?  Factory maf and no translator OR late model maf with translator?

I have the 25168491 MAF and translator.

6

General Buick Tech / Re: New start-up help

« on: January 23 2018, 09:37:22 PM »

What maf are you running? I will check in the am what the maf is koeoff if no one else knows already.

25168491

7

General Buick Tech / Re: New start-up help

« on: January 23 2018, 07:02:20 PM »

maybe, maybe not...for sure the iac is adjusted incorrectly... but the numbers at the warmed up readings are 900 at 12 af which is not too far off.  As you say, he is using the iac screw to adjust the idle speed with.  If he backs it out when warm, the tps voltage will drop and may need to be readjusted before it is all said and done.  Long as it is between 0.38-0.044 all should be good.

Altho I think I said it seemed to be too lean in my last post, it is way rich from what he is saying...that seems to go with his maf numbers.

I would certainly follow your advice to get it warmed up before setting tps and iac.

I will certainly try this as soon as I get the dash back together again. Is there any way to test the MAF? Or by the numbers its showing enough to just swap it out? That is after I run the the tps voltage down. ([size=78%] I think I did this when I 1st set it up but can't hurt) [/size]

8

General Buick Tech / Re: New start-up help

« on: January 23 2018, 01:04:06 PM »

with the iac set normally, there will be about 1.5 threads of the adjustment screw tip emerging to contact the lever.  Is this where yours is?

It sounds like there is an air leak somewhere to me that is making it lean until the ecm goes closed loop and adds some fuel to it...  that is assuming the injectors are spraying correctly.  I don't remember if you changed, cleaned, or what to them before starting.

If set the the iac @ 1.5 threads it would never start. I need to give it part throttle to start. Once started it still needs throttle to run. Upwards of 15-1900 rpms. Runs very rich!


Here's a typical run from cold start to hot
O2-847         828
AF-46           12
L8-163          63
Bat-13.5
INT-128       
BL-118
CLT-70         164
ATS-63         70
RPM-1900     900
TPS-90         44
IAC-175       00


Runs like crap cold.Sputters and stalls if I let the throttle down. Plugs foul out pretty fast. (gone threw 4 set not counting cleaning each set a few times) Once the temp is above 150ish, it's almost like a different engine. Idle smooths out. Will start with no added throttle and idles fine. Can "blip" the throttle and its crisp.
 I was running it every few days with pretty much the same results. I don't think it could be an air leak as I have checked for one (couple of times) If I pull the PCV hose off while cold, the engine runs better. Higher RPMs but better. If I crank open the throttle plate more I can't get the idle down.
Thats where I left it. Have the dash pod out right now to replace the tach so it will be awhile till I can run it again.

9

General Buick Tech / Re: New start-up help

« on: January 23 2018, 12:57:13 AM »

Well it's been awhile and over 20 gallons of gas used. No changes. Starts and runs fine after the engine has passed 150 degs. I guess I'm gonna just have to wait till I can get the car on the road to see if the puter will re-learn how to start properly. So unless you guys can come up with something I'm gonna call it good till it can be put on the road.
Got lots to do to finish her up anyway. Thanks for all your help. I'm sure I'll be back. 

10

General Buick Tech / Re: New start-up help

« on: November 25 2017, 06:35:18 PM »

Todays update= after cleaning plugs and O2- Turned on the key and toggled to IAC- it was reading 140. Started engine and it shoots up to 175. I don't understand why that would happen. Also the AF was 20! I shimmed the throttle to around 1000 RPM and let it run for 1/2hr. Fan coming on @166.(eyes tearing even with the exhaust piped outside) Some where around 150~ suddenly the engine smoothed out some. I checked the AF and it went down to 7. IAC down to 0.
 Was able to plug the vac like back in the regulator and the idle came down to about 750 -800.
I stopped while I was ahead??? (+ my bride was calling me in for dinner)

11

General Buick Tech / Re: New start-up help

« on: November 25 2017, 01:24:38 PM »

After reading 10 pages  I'm wondering how the car ran the day you parked it "too many years ago"
As a rule settings like translator switches, IAC, TPS, fuel pressure, Chips or its settings don't change after time.  I would start there then look for what  varnished gas contaminated, Flush out the fuel system then replace the fuel filter and clean or replace the injectors. Forget about trying to set any parameters  until the car can reach operating temps and idle anywhere around 1000rpms. Hold the throttle open with a wedge to do that and forget about iac's for now.  Also your low compression could be from the cylinders being washed down from being too rich. Change the oil and filter and dont worry about compression until you have a few hours of running time. To save some money you can clean the plugs with some carb cleaner then rinse with starting fluid also clean the O2 sensor with a propane torch a few minutes until it glows.

The donor car the engine came from was wrapped around a tree I was told. I believe that because the header was damaged on the passenger side and that side valve cover was cracked where it hit the fire wall. The kid that owned  the car just had the engine rebuilt. I pulled the intake and oil pan off and it was spotless so I believe that too. The entire fuel system is new. Foam filled Fuel cell, pump, braided SS lines, 2 filters, (strainer before the pump, filter after) Everything was rinsed and flushed before starting the engine.
 So I'm gonna pull and clean the plugs again, clean the 02 sensor and start the engine again. Get it above 1000 RPMs and let it run while I read all about the IAC Dave linked to. I may run out of gas (again) Who knew that little thing was worth 5 pages!

12

General Buick Tech / Re: New start-up help

« on: November 25 2017, 01:07:23 AM »

 So the chip is in. Engine still runs rich and will only start with part throttle. Wont idle unless the vac line is pulled from the regulator. (getting air from that ) Tried adjusting the IAC screw but can’t open it enough to keep the engine running without pulling the vac line off the regulator. The IAC valve is new (20 years old..but new…lol) I removed it just to inspect it. I suspect its bad. Is the pintle suppose to move in and out easy or not? I measured its length cold and then warm. Seemed like it only moved a few thousands in. The other thing I noticed was the IAC count starts at 175 and stays there. Wont go down on idle till I pull the vac line off and the RPMs rise. Then it goes to “0”  So even if the  IAC is ok, how would it back off if the count stays at 175? I believe the thermostat is reading right as the fan comes on at  160~. I read that the count should be 140 at crank and down to 108 at start. What could cause my count to be so high to begin with? Is this what could be causing the engine to run so rich on start up?
I haven't looked but I bet I need to change the plugs again. 
 

13

General Buick Tech / Re: New start-up help

« on: November 09 2017, 01:52:25 PM »

Good idea. I'll wait till the chip gets here.

14

General Buick Tech / Re: New start-up help

« on: November 09 2017, 09:14:37 AM »

Can't hurt anything at this point I guess. I hate thinking about pulling the head since the car is still on jack stands I have to work standing on a milk crate.

15

General Buick Tech / Re: New start-up help

« on: November 09 2017, 08:46:04 AM »

I agree with Rich. I'd fire it up with the new chip  and let it get some run time before I'd pull it apart.

 I did squirt some oil in. Didn't make any difference. But how much is needed? I used maybe 2 table spoons. Could be a stuck valve I guess too.