Pathfinder TB Cold Start Issue
11-20-2006, 10:58 PM
#1
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Pathfinder TB Cold Start Issue
I have a major starting issue and I need some help figuring it out. ONLY when the car is cold, start it, completly dies right away. I have to start and feather the motor to get it running.
I took the TB off the car tonight and found a HUGE leak at the bottom of the TB plate where the vaccum nipple piece is located on the bottom. Would that effect my cold start bad ?? It starts and dies RIGHT AWAY !!! I have to feather the gas to get it running.
Im going to adjust the TPS with the feeler gauge and mulitimeter like the Haynes says to. Im going to get it perfect... I did move the set screw a bit which I hope doesnt mess up my TPS adjustment
Heres a pic of it, its hard to tell but that second pic that copper vaccum nipple moves freely inside the plate. The JB weld gave loose
I took the TB off the car tonight and found a HUGE leak at the bottom of the TB plate where the vaccum nipple piece is located on the bottom. Would that effect my cold start bad ?? It starts and dies RIGHT AWAY !!! I have to feather the gas to get it running.
Im going to adjust the TPS with the feeler gauge and mulitimeter like the Haynes says to. Im going to get it perfect... I did move the set screw a bit which I hope doesnt mess up my TPS adjustment
Heres a pic of it, its hard to tell but that second pic that copper vaccum nipple moves freely inside the plate. The JB weld gave loose
11-20-2006, 11:01 PM
#2
I siliconed the two holes on each side of the TB plate, i dont even have a plate to block of the IAVC since the silicone is doing the job. I have the same problem as you but I can live with the 8-10 sec holding the throttle in. Once I do that it will idle fine and the car starts everytime when its warm or hot.
11-20-2006, 11:05 PM
#3
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Im pretty sure its a Pathfinder TB. I purchased it off of Stephen Max
I have to trace down the problem, I cant live with it like this.
I am using an IACV plate with the stock IACV
-matt
I have to trace down the problem, I cant live with it like this.
I am using an IACV plate with the stock IACV
-matt
11-20-2006, 11:13 PM
#4
That looks very much like the 5th gen, I'm not doubting you but the bottom of the TB is identical to the 5th gen where the IACV goes. I'm curious to know the cause of this too. I also am running the stock 4th gen IACV but I did notice on a stock motor, at cold start up, my SAFC would read like 1-3% throttle and eventually go down to 0 but on the DEK, it doesnt do that. I 'm thinking i may need to adjust the TPS.
Another thing that I did was messed around with the screw adjustment for the TB plate. Before, I had the starting issue regardless if it was cold or hot, afterwards I can get a good start every time except when its cold. Those are so of the things to think about.
Another thing that I did was messed around with the screw adjustment for the TB plate. Before, I had the starting issue regardless if it was cold or hot, afterwards I can get a good start every time except when its cold. Those are so of the things to think about.
11-20-2006, 11:18 PM
#6
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It has to be a TPS problem. The Haynes manual states not to mess with the set screw one bit. I did but I think I got it where it was for sure.
Definetly follow the Hanyes manual, get a .4mm feller gauge and a .3mm feeler gauge and a multimeter and adjust as per the manual. Supposidly thats the way to do it.
I only really got this problem AFTER i messed with the set screw on the TB leading me to believe the TPS is outa wack now for sure.
Definetly follow the Hanyes manual, get a .4mm feller gauge and a .3mm feeler gauge and a multimeter and adjust as per the manual. Supposidly thats the way to do it.
I only really got this problem AFTER i messed with the set screw on the TB leading me to believe the TPS is outa wack now for sure.
11-21-2006, 07:11 AM
#10
I have the same problem as well, although I increased my idle speed and IACV to compensate and it seems to be fine that way.
When I bought mine I was missing the cold start valve that sits on the top of the TB. I have one on my 5th gen TB and have been thinking about moving it over as the valve gives the initial boost to keep the car running.
When I bought mine I was missing the cold start valve that sits on the top of the TB. I have one on my 5th gen TB and have been thinking about moving it over as the valve gives the initial boost to keep the car running.
11-23-2006, 01:23 PM
#13
I also now have the cold start problem with the Pathy TB on my DEK. Rather annoying since I can no longer use my remote start, but whatever....what voltage does the Haynes manual say to set it to when testing with the multimeter?
11-23-2006, 03:24 PM
#15
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No. You need to get a feeler gauge. .3mm and .4mm and put it in front of the set screw and measure it on a multimeter pins 5 and 6. .3 should show continuity and .4 should show NO continuity.
-matt
-matt
11-23-2006, 03:29 PM
#16
The TPS can be set by Voltage too. Should be at 4v at WOT.
http://forums.maxima.org/showthread.php?t=501052
Matt you talking about the same thing? Seems easier to set it to 4v at WOT.
http://forums.maxima.org/showthread.php?t=501052
Matt you talking about the same thing? Seems easier to set it to 4v at WOT.
11-23-2006, 04:10 PM
#17
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I think its two different ways of setting it. Ive heard of the 4v at WOT or the .5 at idle but I dont like that way. I like the way the haynes manual states to do it and thats how I am doing it.
-matt
-matt
12-07-2006, 07:55 PM
#19
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What are you guys doing with Pathfinder TB's for COLD starts ??
My ECU is making my idle Fluctuate and I have to hold the gas in for about 5-7 seconds until the car is warm enough to idle on its own...
Im thinkin of going back to a 4th gen tb. Could it be that the IACV is external and taking too much time for hte air to reach the manifold and feed the motor ??
-matt
My ECU is making my idle Fluctuate and I have to hold the gas in for about 5-7 seconds until the car is warm enough to idle on its own...
Im thinkin of going back to a 4th gen tb. Could it be that the IACV is external and taking too much time for hte air to reach the manifold and feed the motor ??
-matt
12-08-2006, 07:22 AM
#20
That's exactly what I was thinking. I decided to buy a winter "beater" (Mazda MX-6 GT...REALLY fun car for five hundo', BTW) and store both the Max and the 540i for the winter. The Max actually starts quite well if I prime the fuel pump 2X b4 a cold-start. It almost kills, but not quite. I think most, if not all, of this may go away after installing an AFC, setting the base-idle and tuning on a dyno (spring time).
12-08-2006, 07:25 AM
#21
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I have Emanage, which is alot more complex than the AFC, and I cant get it to stay on.
It has to be the externally mounted IACV on the 00VI too far from the manifold + cold cold temps = This problem
It has to be the externally mounted IACV on the 00VI too far from the manifold + cold cold temps = This problem
12-08-2006, 10:52 AM
#23
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Right now I hope its just a sticking IACV in the cold temps not allowing the IACV to open fully to let air into the motor. Resulting in a stalling situation.
-matt
-matt
12-08-2006, 03:43 PM
#24
Gotcha. I'm hoping that mounting the IACV on kris' block is going to help me with the cold starts. Not looking foward to those problems since I'll be installing it soon when the temps are now 20 here.
12-10-2006, 10:21 AM
#26
btw the 95-99 IACV has a SEPARATE cold start higher idle gizmo with a spring that opens the TB so slightly to get it to go to 1500.
using a 4th gen IACV (triangular with adapter) will NEVER help you solve the cold start issue only the 00-01 de-K or 01-02 3.5L pathy iacv.
just a bit of advice
using a 4th gen IACV (triangular with adapter) will NEVER help you solve the cold start issue only the 00-01 de-K or 01-02 3.5L pathy iacv.
just a bit of advice
12-10-2006, 11:23 AM
#27
i think you're the first that I've heard say to use the pathy iacv. Should still be able to solve the problem using the 4th IACV because some guys have it without a problem. So thats not the only way to fix it.
12-10-2006, 11:38 AM
#28
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Im talking the difference of having the IACV mounted externally with a 3/8" hose to the intake manifold or having it mounted externally on the rear of the manifold so you have about an 1-1/4" metal tube going right into the intake stream.
Im NOT using the pathy IACV nor do I want to. There are many guys running the Parthy TB/ 4th gen IACV with this problem and many without the problem..many running the 5th gen TB without the problem as well.
Either my IACV is completly dead or the mounting location is a problem for some reason. We will know soon
Whatever the problem is, its COMPLETLY dieing...does not wanna hold one at all which kinda leads me to belive my IACV is dead possibly.
Im NOT using the pathy IACV nor do I want to. There are many guys running the Parthy TB/ 4th gen IACV with this problem and many without the problem..many running the 5th gen TB without the problem as well.
Either my IACV is completly dead or the mounting location is a problem for some reason. We will know soon
Whatever the problem is, its COMPLETLY dieing...does not wanna hold one at all which kinda leads me to belive my IACV is dead possibly.
12-10-2006, 10:14 PM
#29
quick OT question about the pathy TB. would a vacuum leak be present if one was using the pathy TB, but did not remove the lower portion that leads to the IACV? and neither of the two lines that come off the bottom block or routed anywhere?
12-11-2006, 09:31 AM
#33
I took off the bottom and am making the plate. Do you guys think I should put that nipple on the bottom of the plate? I have a nipple on the bottom of the block I'm attaching the tb too so I was going to use that for IACV vacuum.
12-14-2006, 09:19 PM
#34
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**UPDATE**
Well I adjusted the TPS perfectly as per the Haynes Manual and I am still getting the stalling instantly upon start up. I then bought a Brand NEW NISSAN IACV and the car is still stalling right away on start up. I start the car back up and I have to feather my foot or the car will stall right away..without even a problem. Idle fluctates up and down like the ECU is compesating for something.
I checked everywhere for a vac leak or a boost leak and no luck. I hear air liek its leaking but its prob just air rushing into the manifold from the blower...I will look harder tomorrow.
The only thing I can think of is, guys using the Pathfinder TB with the 00VI need to mount the IACV close or onto the 00 Manifold somehow. The IACV needs to be directly in the intake path. This isnt an issue on the USIM or the MEVI becuase the IACV is mounted directly on the inatake manifold. The pathy tb is huge and completly closed all the time...on the 4th gen ther is the cold start plunger that opens but I have talked to many people about this and even someone that has CUT that off and still had no starting issues. It HAS TO BE THAT LOCATION OF THE IACV> !!!!
This starting issue is really bugging me. I cant even drive the car
-matt
Well I adjusted the TPS perfectly as per the Haynes Manual and I am still getting the stalling instantly upon start up. I then bought a Brand NEW NISSAN IACV and the car is still stalling right away on start up. I start the car back up and I have to feather my foot or the car will stall right away..without even a problem. Idle fluctates up and down like the ECU is compesating for something.
I checked everywhere for a vac leak or a boost leak and no luck. I hear air liek its leaking but its prob just air rushing into the manifold from the blower...I will look harder tomorrow.
The only thing I can think of is, guys using the Pathfinder TB with the 00VI need to mount the IACV close or onto the 00 Manifold somehow. The IACV needs to be directly in the intake path. This isnt an issue on the USIM or the MEVI becuase the IACV is mounted directly on the inatake manifold. The pathy tb is huge and completly closed all the time...on the 4th gen ther is the cold start plunger that opens but I have talked to many people about this and even someone that has CUT that off and still had no starting issues. It HAS TO BE THAT LOCATION OF THE IACV> !!!!
This starting issue is really bugging me. I cant even drive the car
-matt
02-24-2007, 10:27 AM
#36
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has this issue been solved, I'm currently having a very similiar cold start issue on a oovi w/5th gen tb, external iacv. Also, does anyone have the clearance to set the TB butterfly at if the stop screw has been misadjusted?
03-22-2007, 08:49 PM
#38
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Ill have an update over the weekend...
I took apart my setup today and it seems the Two Part Opoxy I used to fill a few holes on the manifold, didnt set correctly...and dripped out over time and heat, causing a HUGE vaccum leak on the rear of my manifold....I am mixing up some JB weld tomorrow and filling the holes again all over...That should solve all my idle problems completly...thing was still surging really badly.....we will see though
-matt
I took apart my setup today and it seems the Two Part Opoxy I used to fill a few holes on the manifold, didnt set correctly...and dripped out over time and heat, causing a HUGE vaccum leak on the rear of my manifold....I am mixing up some JB weld tomorrow and filling the holes again all over...That should solve all my idle problems completly...thing was still surging really badly.....we will see though
-matt
03-22-2007, 08:52 PM
#39
Matt I hope the issue clears up soon. These PF tb's seem to through out more problems than anything. I need a new one because mine doesn't close enough to give correct tps readings...what a pain in the a$$. Look forward to hearing an update.
03-22-2007, 08:59 PM
#40
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Originally Posted by Cdg2125
These PF tb's seem to through out more problems than anything.
Originally Posted by Cdg2125
I need a new one because mine doesn't close enough to give correct tps readings...