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Re: Failed emissions test...again [Re: Snowtoy] #930089 02/26/09 08:21 AM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
Tune-up and valve adjustment: check
Checked for vacuum leaks: check
fairly new O2 sensor: check
new cat: check

timing set with shorted connectors
camshaft, EB 261C brand new
So I'm down to leaky injectors, leaking cold start injector and the gaskets between the pipes, wich I only tightened.
It's only at idle the HC is too high. It lowers dramatically when raising the rpm, around 40 @2500
Cold start injector, what is that?
At idle the engine feels and sounds like its missing a bit. It's not a completely smooth idle, but I assumed it was just the chattery type idle from the upgrade cam shaft...
One other thing sometimes when starting the truck, when warm and sitting for a while, it failes to fire directly. Then it takes quite a few turns on the starter to fire it up. I had a feeling that maybe it was a fuel pressure issue...but maybe these problems are connected to eachother.

From the Off-Road World
Re: Failed emissions test...again [Re: huskyohilux] #930090 02/26/09 11:20 PM
Joined: Apr 2002
Posts: 3,567
Snowtoy Offline
Roll Me Over
The cold start injector sprays fuel into the intake manifold to richen the fuel mixture on start-up. Ii is a small valve, nothing the size of the actual injectors. I am not sure if it only adds fuel on initial start-up, or until the engine is at operating speeds. Looking from the front of the truck at the engine, find the EFI on the intake manifold, the cold start injector is to the right of the"I". It has an electrical connector and a small fuel line attached to it. I don't know how often they go bad, or if they are rebuildable/cleanable, but i would imagine they can get clocked, or not fully close off after years of use.

I would think that the exhaust leak would be more of an issue at idle, since the volume of exhaust would be less, it would allow for fresh air to be drawn into the system.

Quote
One other thing sometimes when starting the truck, when warm and sitting for a while, it failes to fire directly. Then it takes quite a few turns on the starter to fire it up. I had a feeling that maybe it was a fuel pressure issue...but maybe these problems are connected to eachother.

Is the starter turning, or just clicking? If takes a few turns of the key/holding it open for a few seconds, it is likely the starter. I had the same issue with my '91, changed the contacts problem solved.

However if the starter/engine is turning over, it could be a poor fuel/air delivery, even timing. W/the EB cam, is there a different timing setting, or do you use the stock timing? What is the timing before and after jumping the terminal?


If you can get just sniffer test for free, or can come back a few times to the shop you paid for the the last test w/o being charged, I would replace the exhaust gasket at the manifold/down pipe, and take it back. If still "No Pass", look into the cold start injector, and the timing.

If you are allowed/smog tech is willing to, have him adjust the idle and retest. If your idle is set at oem specs, it may need to be bumped up a little due to the cam. I know w/my mod'd 3.0, the HC's are higher at 8-850 then they are 1050rpm's.


More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
Re: Failed emissions test...again [Re: Snowtoy] #930091 03/01/09 01:41 PM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
Once again one of the nuts from the manifold/down pipe had loosened themselves. I just got new gaskets and gonna get new nuts or loctite the old ones and re-take the test next week.

The starting problems has worsen lately. It turns over nicely so it's not a starter issue. Could be that it gets flooded from ideling before shut down and then failes to fire right up. Hopefully that will be taken care of at the same time with no extra fuel injected at idle speed.

Gonna re-check the timing, making sure I did it right. I just checked the FSM and it sais 5 dgres w/ shorted connectors and 10-14 w/o @750 rpm. Pretty sure I have an other spec note that sais 12 dgres w/ shorted terminals.
I will then raise the idle closer to 1000 rpm to smoothen the run as well, if needed.

Re: Failed emissions test...again [Re: huskyohilux] #930092 03/11/09 05:10 PM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
My problems is still unsolved...
Installed new gaskets and nuts for the exhaust manifold/tail pipe connection. Also put a new gasket under the 02 sensor.
Still HC values above 500 ppm.
So now I'm down to leaky injecors or leaky cold start injector. How about the coolant temp sensor, could that be part of the problem?

Re: Failed emissions test...again [Re: huskyohilux] #930093 03/11/09 05:21 PM
Joined: Jan 2000
Posts: 12,153
4Crawler Offline
Web Wheeler
*****
You might check to see if you have vacuum at the fuel pressure regulator:
http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/8.html

With no vacuum feedback, the fuel pressure can rise too high at low engine loads and cause the engine to run rich (high HC readings).

And yes, you could test the coolant temp sensor, if it is reading too cold, the ECU will try to get the engine to warm up by dumping in extra fuel.

Re: Failed emissions test...again [Re: 4Crawler] #930094 03/15/09 07:59 PM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
Well I only have 'til next wednesday to pass before the truck is given a forbid to drive.
I'm pretty sure that the problem is engine electrical...
It has gotta be related to the starting issue as well.
After sitting for about an hour it does the same thing every time now. Fails to fire right up and then takes a few turns to fire up, like if it gets flooded or something. The plugs doesn't look too wet though.
I replaced the coolant temperature sensor, no difference.
One other thing, we moved the TPS last summer. Turned it all the way to the right and the engine felt better then. It doesn't seem to make much difference where ever it's placed but I can hear the engine sound change a bit. Where should it be set? I checked the resistances from the pins and they were fine.
Otherwise I'm down to the injectors, cold start injector and fuel pressure regulator. Where should I start? I checked the FSM and the injectors seem to request some SST to test. How do I test the fuel pressure regulator? Any other ideas that could cause the high HC @ idle and the starting issues when warm and sitting for a while? Can't be that many things left to test, just gotta scratch them of the list one by one and hopefully not get broke in the mean time

Oh, and I'm not 100% sure the timing is perfect. The engine does feel like it's missing on idle.
is it 5 dgres whith shorted terminals and 10-14 w/o?
It does feel friscier when advanced beyond that

Last edited by huskyohilux; 03/15/09 08:03 PM.
Re: Failed emissions test...again [Re: huskyohilux] #930095 03/15/09 08:11 PM
Joined: Jan 2000
Posts: 12,153
4Crawler Offline
Web Wheeler
*****
Check for vacuum at the fuel pressure regulator, easy to do and even easier to just run a line directly to it:
- http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/10.html

Re: Failed emissions test...again [Re: 4Crawler] #930096 04/14/09 09:38 PM
Joined: Jun 2000
Posts: 1,002
carter Offline
Body Damage is Cool
Quote
You might check to see if you have vacuum at the fuel pressure regulator:
http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/8.html

With no vacuum feedback, the fuel pressure can rise too high at low engine loads and cause the engine to run rich (high HC readings).

And yes, you could test the coolant temp sensor, if it is reading too cold, the ECU will try to get the engine to warm up by dumping in extra fuel.


Roger, thank you so much for this tip!!! I struggled with high HC since 2002. I have failed smog twice, and when I pass the HC's are close to the MAX 131ppm. With over 300,000 original miles on the engine, I figured it was just because the engine was old.

I checked, and my VSV was bad. I bypassed it like you did, and I just passed smog with flying colors. HC measured only 32ppm at both 15MPH and 25MPH!

So, thank you again. This is awesome! <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />


Mike Carter
85 & 86 4Runners

My Website
Re: Failed emissions test...again [Re: huskyohilux] #930097 04/26/09 06:34 PM
Joined: Aug 2001
Posts: 2,941
DRTDEVL Offline
J
Roll Me Over
*****
<img src="/forums/images/graemlins/zombie.gif" alt="" /> Set that TPS properly!!! The easiest way to get close without feelers and resistances is to loosen it up a little to where you can turn it, fire up the truck, put the jumper in the diagnostic connector, and spin it until you are at the closest possible position before the idle raises up. Tighten it down at that point, and be on your merry way.

Also, make sure the truck is 100% warmed up before it goes on the machine.

I also have the exact problem with the hot starting... Crank crank crank crank crank crank and finally fire. Not sure what causes it.


"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).
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