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Old 04-13-2018, 02:05 AM   #11
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Ok everyone so I changed intake gasket and tb gasket still same problem checked with starting fluid for vacuum leaks and found nothing. But I noticed when starting, the injectors pump a small amount then nothing until I hit the throttle then they pump a small amount again but no fuel through injectors when holding throttle steady. So it seems I have a fuel issue but I can't figure out why. Has anyone had this problem I have searched for days and can't find anything. I have good fuel pressure to my tb and when I put jumper wire to injectors they both work fine. I'm stumped
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Old 04-13-2018, 04:54 AM   #12
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Okay...this might be the time to start considering paying for a professional diagnosis, no kidding. I have been down this road before, and sometimes it comes to the point where you stop chasing...and start paying for information.

The usual fee for such a diagnosis from a good shop here in the Seattle area is around $150. And there are a couple of things to think about here.

First...make sure they have a smoke machine...and that they actually run the smoke test. This will find any and all vacuum leaks. This is the sort of deal where when you take the truck in, you cut through the baloney and make sure they understand where your hard earned money is going. In other words...you've chased this problem to the best of your ability, and now it's time for a pro to tell you WHAT THE HELL IS EFFEN WRONG.

Takes a good shop, one that cares, one that works with people and doesn't feed you baloney.

I didn't look to see if you had tried changing the injectors. If you have good fuel pressure, but nothing is coming out much on the other end, I'm wondering if you bought aftermarket injectors that could likely be made in China. Sometimes they work. (Aftermarket parts for Nissan) and sometimes they are garbage right out of the box. Mostly, they will be good, but sometimes....
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Old 04-13-2018, 05:00 AM   #13
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I would check that your throttle position sensor is working correctly. Since you can make the injectors work by jumping them they probably aren't the problem. Something isn't telling the ECU to spray gas into the throttle body. No codes, right?
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Old 04-13-2018, 05:07 AM   #14
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Quote:
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I would check that your throttle position sensor is working correctly. Since you can make the injectors work by jumping them they probably aren't the problem. Something isn't telling the ECU to spray gas into the throttle body. No codes, right?
Yeah...could be the TPS, too. They are about $110-$125 all day on eBay.
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Old 04-13-2018, 10:42 AM   #15
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Yeah I have no codes and I did change out one injector
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Old 04-13-2018, 03:27 PM   #16
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At certain throttle positions, it seems to be getting too little fuel to go along with teh amount of air you are giving it.
Rule out fuel pump because it CAN rev high.
Rule out the injectors for the same reason.

Others mentioned TPS, and I agree that is the next thing to check, along with the connector itself.
I had those symptoms off and on as I was driving through a hilly section of desert. It turned out to be a broken wire in the TPS connector that was making and breaking.
When the wire lost contact, it had almost the same symptoms that you describe in your original post.

The service manual explains how to test it with a meter.
I may still have my trail spare if you end up needing one. PM me if you do, and I'll look through my parts. I have no more use for it.
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Old 04-14-2018, 12:33 AM   #17
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Have you done this one?

FIX: erratic idle, low speed driveability, possibly more
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Old 04-16-2018, 01:05 AM   #18
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Ok so I tested tps and it seems to be working so does anyone know what else can affect the injectors
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Old 04-16-2018, 01:07 AM   #19
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I did go ahead and look at this and my injector wire splice is ok
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Old 04-16-2018, 01:54 AM   #20
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If you can read these, use them to troubleshoot the injector. I donít know why my phone uploads shitty pictures.



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