Author Topic: LQ4 IN 84 ....IDLE?  (Read 3359 times)

Offline LSXCHEVY

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LQ4 IN 84 ....IDLE?
« on: January 07, 2015, 03:03:11 PM »
finally have the 6.0 back running after changing the crank sensor ...any ideas on how to improve idle quality in the video? :-\
I bought this motor from junkyard , tore down, rebuilt, chunked a couple thousand at it and here it is... thoughts!@??

 http://youtu.be/e4vVYiYh4Hg



Offline Irish_Alley

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Re: LQ4 IN 84 ....IDLE?
« Reply #1 on: January 07, 2015, 11:43:01 PM »
cant see the vid but where did you get the crank sensor? from what i have heard/read if its not ac then the motor wont like it and theres a chance of it being crappy right out of the box
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline LSXCHEVY

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Re: LQ4 IN 84 ....IDLE?
« Reply #2 on: January 08, 2015, 11:41:58 AM »
BWD...oreilly...50 bucks or so....started right up when I put sensor in versus just cranking with no start on the old one....hopefully it lasts a while...I hate taking the starter off and back on...  link doesn't work ??   http://youtu.be/e4vVYiYh4Hg

Offline Irish_Alley

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Re: LQ4 IN 84 ....IDLE?
« Reply #3 on: January 08, 2015, 03:35:24 PM »
wasnt the link but a firewall. but did if have a smooth idle before the crank sensor
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline VileZambonie

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Re: LQ4 IN 84 ....IDLE?
« Reply #4 on: January 08, 2015, 06:32:11 PM »
How about details?
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Offline LSXCHEVY

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Re: LQ4 IN 84 ....IDLE?
« Reply #5 on: January 09, 2015, 10:29:42 AM »
I have not ran the engine too long......just rebuilt the 2000 all iron lq4, 6.0...new rings, all new bearings, cam bearings too, new: oil pump, timing chain, water pump , alternator, starter,cam sensors...all of the small stuff.. is new..of course now the crank sensor is new also...ran just fine when I first started for the first time....idles kinda of high then has a small run on issue when I kill the ignition....great throttle response though...idles smooth till it drops in drive..think timing is too high @ idle..

700 r4 with factory stall....built trans...shifts very strong,3.73 gear non posi right now,stock driveshaft..cam is a an edlebrock 2215 with performer dual plane, for now running just a 600cfm that cam off of old 350...in the video was the first time I actually shifted into drive...I figure I need to come up with my own curve...truck weighs a lot so.. right now im using pill#4 (almost 36* total timing, heard tat was a bit much?)...I will try a plot that I came up with this weekend...need to get the exhaust welded up so I can use my a/f gauge and tune from there..the 02 bung has to be moved as the shift linkage gets in the way... trying to think of more details for Mr. Vile...lol  8)

« Last Edit: January 09, 2015, 10:34:53 AM by LSXCHEVY »

Offline Captkaos

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Re: LQ4 IN 84 ....IDLE?
« Reply #6 on: January 09, 2015, 06:05:12 PM »
what rpm is it idling at?  What carb? how much does it drop in gear?  It sounds like it is open exhaust is it?  is the O2 connected?

Offline LSXCHEVY

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Re: LQ4 IN 84 ....IDLE?
« Reply #7 on: January 09, 2015, 10:27:33 PM »
CApt..
..idles around 1000 in park..then drops to around 550-650 in drive...you can hear it in the video when i drop it in drive...25*@1000 rpm seems high?...right  now using the former carb...edl 1406   600cfm..all i got for now..wanted to get a 670 soon..or 750...right now it is open exhaust..had o2 sensor connected but got an out range lean condition cause of the proximity of the sensor to the opening of the exhaust i assume..getting the exhaust welded this weekend ...disconnected o2 for now   btw i havent pulled this truck out of garage since i dropped it in...neighbors and city wont like the open heads...
« Last Edit: January 09, 2015, 10:33:37 PM by LSXCHEVY »

Offline Captkaos

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Re: LQ4 IN 84 ....IDLE?
« Reply #8 on: January 10, 2015, 12:55:44 PM »
Idle it kind of high, it should be closer to 700 in my opinion.  I wouldn't mess with it without all the sensor hooked up with an exhaust on it.

Offline LSXCHEVY

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Re: LQ4 IN 84 ....IDLE?
« Reply #9 on: January 12, 2015, 09:38:16 AM »
found that my choke wire wasn't getting switched 12v...solved idel problem... o2 sensor hooked up was reading very lean condition...around 16..17 at cruise..then this happened....   http://forum.73-87chevytrucks.com/smforum/index.php?topic=30094.0