YotaTech Forums  

Go Back   YotaTech Forums > Toyota SUV & Truck Tech > 86-95 Trucks & 4Runners
Sign in using an external account
Register Forgot Password?
Search


86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 12-13-2010, 03:35 PM   #1 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Feb 2010
Location: Denver
Posts: 43
Is it my cold start injector time switch?

My rig is really hard to start or it won't start at all when it's cold. If I squirt starter fluid into the air intake hose my truck will stumble to a start.

I checked my cold start injector time switch as described in the FSM. I think its shot, but before I drop the bucks for a new one, I want to verify that Ichecked the CSI switch right.

I set my meter to 20k ohm, and the meter read .08. The coolant temp was well over 100 degrees fahrenheit. according to the FSM if the coolant temp is over 77 the CSI resistance should be between 70~90 ohms. So is the ".08" reading on my meter 80 ohms? Sorry about the noob question.

Thanks guys!
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-13-2010, 04:36 PM   #2 (permalink)
Registered User
Personal Sales Rating: (0)
 
myyota's Avatar
 
Join Date: Oct 2006
Location: GrangeVille, Idaho
Posts: 4,170
Most likely the cold start time switch is bad, they do wear out. I would recommend that you pull the cold start injector and clean it, they get carbon build up on them from the EGR and that can plug them up. Have you checked the cold start injector to make sure its good ?.
__________________
86 Toyota 4Runner

Solid Axle Swap, 5'' lift, 37x12.50-15 MTR`s, Trail Gear High Steer, 5 speed manual swap, InchWorm Duel Cases, 63'' Chevy Springs In The Rear, 5'' Trail Gear Springs In Front, 27 Spline Chromoly Axles In Front, 4.88 Gears, Detroit Locker In The Rear, High Pinion Front With An ARB, Downey Header, AFM Upgrade, 95 Amp Alternator, Trail Gear Sliders, Addicted Offroad Front Bumper.
myyota is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-13-2010, 08:41 PM   #3 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 2,831
".08"k ohms is 80 ohms, but I've never seen a meter that would make you work that hard to figure out the scaling. So you might want to read up on your meter.

Better yet, consider pulling the injector out of the plenum, but leaving the fuel line (flex hose) and electrical connected. Put the injector into a glass jar with a rag over the top (it might splash), and have someone crank it. Does the injector spray? That way you'll have an end-to-end test. If it doesn't spray, you can work backward checking the electrical, the fuel connection, the injector itself, etc.
__________________
1994 6cyl 4wd XCab -- all stock
scope103 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 09:59 AM   #4 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
So the CSI switch is reading within spec. . Does that assumption sound right to you?

Do I need to buy the special wire harness from Toyota to run the test on my cold start injector or is there a way to jimmy-rig it?

BTW, do you guys have a photo showing where the injector is on a 3vze?

I'd like to check the resistance while it's on the truck before removing it. One more thing, the FSM states that you can't reuse the gaskets on the injector, are the gaskets something easy to get?

Thanks!
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 10:13 AM   #5 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 2,831
If all you want to do is test the continuity of the injector, you don't need a wire harness. Just pop off the connector (it has a lock wire) and the pins are exposed.

The gaskets are aluminum, and cost about a buck each at the dealer (you'll need two). I think they are "pure" aluminum, and crush has you gently torque them down.

Some folks get away with reusing old ones (I have to admit that I've done it once or twice), but you're dealing with gasoline and a leak would be a "bad thing."
__________________
1994 6cyl 4wd XCab -- all stock
scope103 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 12:45 PM   #6 (permalink)
Contributing Member
Personal Sales Rating: (0)
 
Marc's Avatar
 
Join Date: Sep 2003
Location: Winnipeg, MB, Canada
Posts: 1,018
Quote:
Originally Posted by scope103 View Post
Better yet, consider pulling the injector out of the plenum, but leaving the fuel line (flex hose) and electrical connected. Put the injector into a glass jar with a rag over the top (it might splash), and have someone crank it. Does the injector spray? That way you'll have an end-to-end test. If it doesn't spray, you can work backward checking the electrical, the fuel connection, the injector itself, etc.
Have you done what scope103 suggested?
__________________
'91 4Runner SR5 V6 4X4 Auto, A/C, 4.56, 31x10.5x15 Nokian Vatiiva Tires, Taurus fan (removed)
'90 4Runner SR5 V6 4X4 Auto, A/C, 4.56
V6 power with V8 fuel mileage
I've used Fram oil filters and dino oil in all my stuff for 30 years and never had oil related trouble
Marc is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 02:28 PM   #7 (permalink)
Registered User
Personal Sales Rating: (0)
 
waynesworld's Avatar
 
Join Date: Mar 2010
Location: hampton virginia
Posts: 143
waynesworld1966
hey i wouldn't recommend putting starting fluid in a engine .try sum wd-40.
__________________
89 toyota sr5 4x4 excab 22re 5 speed,4runner seats 167xxx 31x10.50 bfg at dick cepek rims,bushwacker fender flares brand new toyota shortblock engnbldr rv head 261c,lce rocker assembly, marlin crawler1200pd clutch.installed new engine 6-5-11.flomaster 40series muffler 2-1/4 catback exhaust, roundeyes headlights
waynesworld is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 03:08 PM   #8 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
I did the test for resistance like the FSM describes, I got no reading. Is it safe to assume that the injector is dead, or should I still pull it and test it like scope recommended?
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-14-2010, 06:23 PM   #9 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 2,831
You tested the resistance of the injector (not the cold start time switch), and got "open"? (I never know what people mean when they measure resistance and get "no reading." Zero is a reading. Infinite (open) is a reading.) The correct resistance is only 2-4 ohms, and the leads alone on my fancy 4 1/2 digit ohmmeter have 1.7 ohms. So the FSM test is not easy to do correctly.

If you actually got "infinite" ohms then the injector is gone. Since it is a $150 item, I would be tempted to do one more step. You're removing the injector anyway. Once it is out, put 12v on the two terminals and see if you can hear anything (listen closely). If you can, hook it back up the fuel line. Use the FP connector in the diagnostic plug to pressurize the fuel system, and put 12v on the injector again to see if it sprays. If your FSM test was correct, you should hear nothing, and you should get no spraying. Then you can spend the $150 with a clear mind.
__________________
1994 6cyl 4wd XCab -- all stock
scope103 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-15-2010, 06:16 PM   #10 (permalink)
Registered User
Personal Sales Rating: (0)
 
myyota's Avatar
 
Join Date: Oct 2006
Location: GrangeVille, Idaho
Posts: 4,170
Quote:
Originally Posted by hermyboy3000 View Post
I did the test for resistance like the FSM describes, I got no reading. Is it safe to assume that the injector is dead, or should I still pull it and test it like scope recommended?
If the cold start injector is bad, instead of buying a new one call Yota Yard, there a toyota wrecking yard in Denver and see if they have one.
__________________
86 Toyota 4Runner

Solid Axle Swap, 5'' lift, 37x12.50-15 MTR`s, Trail Gear High Steer, 5 speed manual swap, InchWorm Duel Cases, 63'' Chevy Springs In The Rear, 5'' Trail Gear Springs In Front, 27 Spline Chromoly Axles In Front, 4.88 Gears, Detroit Locker In The Rear, High Pinion Front With An ARB, Downey Header, AFM Upgrade, 95 Amp Alternator, Trail Gear Sliders, Addicted Offroad Front Bumper.
myyota is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-15-2010, 10:47 PM   #11 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
Scope, I got all zeroes in my test of the cold start injector, not infinite.

My yota, I completely spaced yota yard! Thanks for the reminder!
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-16-2010, 06:26 AM   #12 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 2,831
The spec is 2-4 ohms. Are you sure your ohmmeter can measure that small a value? If you're on the 1k range only 1% error will swamp that reading. (and if you're using an analog ohmmeter, well ....)

I'm no expert on injectors, but my guess is that they are more likely to fail open than shorted. Before I paid $150 or picked up a mystery part from a junk yard, I'd do a functional test of my own injector, using any of the ways I described.
__________________
1994 6cyl 4wd XCab -- all stock
scope103 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-16-2010, 11:08 AM   #13 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
Scope, I'm using a digital meter on the 20k setting. But, I'm planning on doing the function test this weekend. So far it's been starting "rough"without the starting fluid.
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-16-2010, 12:31 PM   #14 (permalink)
Registered User
Personal Sales Rating: (0)
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 2,831
LOL! What's the smallest resistance you can measure with a 3 1/2 digit digital meter on the 20kohm scale? A reading of 0001 is 10 ohms! So of course you got 0000 when you tried to measure 2-4 ohms.

Try an electrical test (like put 12v on the terminals and listen); it will be easier to do.
__________________
1994 6cyl 4wd XCab -- all stock
scope103 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-19-2010, 05:16 PM   #15 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
Scope - you're probing of my testing technique made me take a closer look at the meter. I have a setting that goes 200 ohms, this gave me a reading of 5.6 on the cold start injector. So, thanks for second guessing my results! I also did the test you recommended, I did get the injector to squirt.

Anyhow, I found an injector at the junk yard that is within specs, I installed it today. So, I'll let all of you know how it goes tomorrow.
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-30-2010, 07:31 PM   #16 (permalink)
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
Join Date: Feb 2010
Location: Denver
Posts: 43
Wink

Alright, been over a week since I installed the "new" injector the truck starts up, it's not an instant start, but it's quick enough!

Thanks a lot for all the help!
__________________
***********
'91 4Runner
3VZE 3.0L
4WD
Automatic

Last edited by hermyboy3000; 12-30-2010 at 07:33 PM.
hermyboy3000 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 12-30-2010, 07:31 PM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
1994, 3vze, 4runner, 86, 92, bad, cold, ignition, injector, remove, resistance, start, switch, time, toyota

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 12:35 AM.


2010 InternetBrands, Inc.

Search Engine Friendly URLs by vBSEO 3.5.2