1990 Throttle hesistation

[Schrade]

Alternator IN, withOUT moving a THING - not the upper rear alt mount bracket, plenum, anything.

Trick is to insert the alt lower mounting flange into the WP recess FIRST. Then you'll have to spin the impellor to give just a little marginal clearance of the impellor to the OTS.

Then just a little coaxing to get the last alt housing edge under the plenum.

Then put the pivoting bracket into place, Bat+ Output nut on, rear bracket bolt, and you're done.

Time to do a little editing in 'Solutions' there Mr C!!! Vids of removal, and of re-install are uploading to Y/T now.

First one ever to document Alternator removal with plenum in place???

So everything zipped up, pulled the trigger, and she fired up 2nd try. Closed Loop, idle rock steady - AGAIN. And after shutdown, no smoke, sparks, inferNO.

Restrictor gasket is still installed for DataMaster logging. Secondary butterflies just let in a little more air in, which isn't a big deal, but it's IRREGULAR flow, not continuous 100% steady amount. Restrictor gasket will allow for more minute, steady calculations in DM. THEN we can look at what's getting in there...

[Dynomite]

Originally Posted by Schrade

Alternator IN, withOUT moving a THING - not the upper rear alt mount bracket, plenum, anything.

Time to do a little editing in 'Solutions' there Mr C!!! Vids of removal, and of re-install are uploading to Y/T now.

First one ever to document Alternator removal with plenum in place???

OK......You DID remove the Air Horn and Throttle Body
Was either of those removals necessary?

Now given I can remove the Plenum with Air Horn and TB attached in 10 minutes Removing Plenum (including the 10 minute Plenum Removal)

I will post a Link in -Solutions- In the ZR-1 ELECTRICAL Section as the First Tip under BATTERY AND CHARGING
After you post this Video in YOUR OWN Post or I will just leave it here. Left Click on Photo to watch Schrade Remove his............................................... Alternator

I always had my Plenum Off so never tried removing the Alternator by itself without removing anything else.....besides if I had to.......just looking at it...prolly would not have tried it anyway without removing the Plenum

Chuckie needs some Chili to warm up....



I did remove the Heads one time with engine in car and after Heads were removed I could almost lift out by hand the rest. So pulled the rest simply because Timing the Engine is a lot simpler engine out of car.

[Schrade]

Originally Posted by Dynomite

OK......You DID remove the Air Horn and Throttle Body
Was either of those removals necessary?

Don't know there Cliff; they were both still removed, but I seriously doubt that you could pull the alt with TB in. You really need to see that lower center flange of the alt, to guide it into the recess above the WP.

How do you embed video in your post?

Chuckie needs some Chili to warm up....

Chili? Nuh-uh; need that violin player who plays for your Lord of the Dance outfit!!! She could Warm my Global / Change my Climate better than a bottle of Guinny Stout ethylene Lager


===================================

Now where's Dom here - when I start with DM logging here, do I need to have the Sec power key on? Or is it already defaulted on, with Marc's chip for sec vac delete?

[Dynomite]

Originally Posted by Schrade

How do you embed video in your post?

I copy your video to my puter and then upload same to Photobucket....then copy IMG Codes and paste into post.

Or more Simply for you now......Right Click on my imbedded Video copy of your video and Left Click Properties....Copy URL Address and paste into your post as IMG Code....

There....now the secret is out

[Schrade]

Looks like someone HAS done removal without plenum pull, but there's always room for improvement...

install vid...

Is this bracket the same on my '90, as on Geof180's LT5??? Sure wish someone would have mentioned it to me here...



Anyway, temps got above freezing, thanks to a little Global Warming, and I played with DM a little here.

Started this thing up, and it fired IMMEDIATELY .

Once it went CL, I did a vid showing incremental increases with the throttle stop screw, and DM readout in the foreground. She's running perfect, although it still shows the hesitation once it goes above 1.6% TO - although it doesn't manifest as a 'hesitation'; more likely just irregular RPM's...

Working on .csv formatted file now here........................

[GOLDCYLON]

I have done it with just the air horn removal. It's easier with the TB out of the way but I only had an Air Horn gasket when my Alternator crapped out.

Yes the smaller alt bracket is the same from MY90 - MY95

[Franke]

I see what you are saying. I'm a bit concerned about the right bank fuel (ST/LT) trim not changing much. I wonder if your right bank O2 sensor is lazy or malfunctioning.

[XfireZ51]

Can't tell much of anything w/o the datalog. It seems to be running rich is about all I could make out, then goes lean a bit. You cranked in a awful lot of throttle change.

[scottfab]

Originally Posted by XfireZ51

Can't tell much of anything w/o the datalog. It seems to be running rich is about all I could make out, then goes lean a bit. You cranked in a awful lot of throttle change.

Exactly right. It'd be hard enough diagnosing a stock set-up without that data but a modified one? Oh boy.

[XfireZ51]

Based on what Marc has said, there's nothing to see here, move along.