Any Ideas

[nametakennow]

Once the part is changed the car should start functioning normally.

How's your water temp gauge? Scroll up to my post about that.

[ihenson711]

I haven't noticed anything weird with the temp gauge.. and as far as messing up it pretty much happens while on the road driving, but it will surge while the car is parked and idling. Could these symptoms actually come from a bad Coolant temp sensor?

[Boosted4Speed]

it could be that you got bad gas... I knew it was not your MAF. just pull the gas out and have it tested and then threaten to sue the gas station that sold you it

[ihenson711]

Yeah.. That's what I thought it was originally, but I have filled up about 3 or 4 times since the first occurence and have run several bottles of heet drygas, octane boost, and Cleaners.. and it's still messing up.. Thanks for your thoughts on this.. if you think of anything else please let me know.

[Boosted4Speed]

honestly stop adding additives to the fuel. I would siphon (sp) out the gas and perhaps change your fuel filter (which can be accessed by removing the back middle seats) and refill with a 91 or 93 octane.

[ihenson711]

Nissan told me that there isnt a fuel filter for my car, they said there is only a non serviceable fuel screen and then of course the fuel pump. Also when I first bought the car I went to Napa auto to buy plugs, fuel filter, etc.. and they also told me there was no serviceable fuel filter. Does your year have a fuel filter.

[nametakennow]

Oy, avoid fuel additives. I wouldn't bother with siphoning out what you've got, though.

I'll do some hunting about this and get back to you.

[ihenson711]

Thanks man.. I'll check back later today..

[Boosted4Speed]

well its not your everyday fuel filter. basically its a sock looking thing connected to the fuel pump.

[ihenson711]

Hmm.. Really, and it's actually serviceable? Wow if thats the case and its relativley cheap I guess it couldn't hurt to replace it. You said you can get to it from inside of the car?

[nametakennow]

The fuel tank is under the back seat. It's easily accessible if you just pull out the seat, which is held in by a couple of clips.

Haven't had a chance to do info digging yet, I should be able to tonight.

[ihenson711]

I thought the Fuel pump and it's surrounding parts were all in the fuel tank!

[ihenson711]

Hey man.. Have you heard of any tech bulletins for the EGR Temp sensor? I called NAPA and they said they have a tech bulletin on the EGR, and the symptoms are pretty much exacly what I have been experiencing....

[nametakennow]

There's no recalls, but it's been a long time since I looked at the TSB's. Head to Edmunds.com and look at their list of TSB's. If it's on there, I'll add it to the list of things to watch out for.

The fuel pump is in the fuel tank, but you can access the pump from above through the seat.

[ihenson711]

The guy at the NAPA tech center said if it was the fuel screen I should experience lond cranks to start the car..

[ihenson711]

Well.. I have done quite a bit of research today and it looks very probable that my Coolant Temp Sensor is bad. I read on this forum that another guy was having the same issue as me with a 350z and he replaced the CTS and it fixed the issue. For 30.00 I cant go wrong. Nametakennow you have been great, I know that earlier you mentioned that this could be the issue so as soon as I get out of work I am getting the part and putting it on.. I will post my update shortly after.

thanks again.. this forum ROCKS!!!!!!!!!!!!!!!!!!!!!!!!!!1

[ihenson711]

Well I installed a new Coolant Temp Sensor tonight..... I totally thought the car was fixed, but after driving it for a bit it started doing it again. Man I am so frustrated, and the worst part is I have no Idea what to do next. Do you guys have any more Ideas?????


Modified by ihenson711 at 7:45 PM 2/13/2008

[Boosted4Speed]

Edited by Moderator: I know you're trying to help, but we don't appreciate references to other forums for obvious reasons.

[nametakennow]

Get in touch with a dealer and see if you're subject to the crank position sensor recall or TSB. Do the same for the throttle position sensor. Both are common issues that I'd completely blanked on before.

[ihenson711]

Hey guys.. Well I took my car to a really good nissan mechanic here in Nashville.. This guy has been awesome, he actually works for a Napa auto care center. Anyway.. He pulled the harness off the Crank position sensor and found oil on the inside of the connector, which means the sensor was leaking so I went to the dealer and bought a new cam sensor and a new crank sensor. He put the new sensor's in and the car was still freaking out so he decided to do some fishing under the hood with the car running. As he was fishing around he started wiggling the harness that connects to the injectors, and wham.. everytime he wiggled the harness the car messed up and it even stalled a few times. I decided to leave the car overnight and he is going to try and trace down the exact problem. So so far I have purchased a new Coolant temp sensor, a crank sensor, cam sensor, used maf, new Iridium plugs.. and it looks like it could be just a bad connection. You gotta love modern cars with all the electrical junk.

[ihenson711]

Hey all.. I have continued to live with the hesitation/bucking issue for over a month now and have tried several things as you can see from earlier in the post.. but I will run a quick list so you dont have to look back. I removed the intake plenum and cleaned it along with replacing the injector seals and cleaned the injectors to the best of my ability. I have replaced the following: Coolant Temp Sensor, Crank & Cam Sensor, Used MAF, New plugs, and I just put a can of BG44k in the tank yesterday. After I changed all of the sensors listed above I pulled out the fuel pump assembly and there was quite a bit of crud pinned between the assembly and the fuel filter screen..So I cleaned it all out and after I did this the car ran really good for several days. Once it started to mess up again I decided to pull the pump again and what do you know there was crud at the bottom of the assembly again. I have pulled the pump assembly probably 4 or 5 times now and everytime there seems to be what looks like little sand particles/crud. I have shined a flashlight in the gas tank and it looks crystal clear from end to end, but It seems like this is the problem because after I clean the pump assembly out it seems to run fine and then randomly get bad again. Any Ideas..... Also does anyone know where to find the TPS sensor on the 02 Sentra Spec v and/or how much to replace. I figure that the TPS sensor is my last resort.

thanks

[nametakennow]

The TPS is on the throttle body, I don't have a pic to point it out, so look it up in the FSM.

I'd try getting the tank drained and cleaned. It sounds like some sort of buildup has occurred and it gets loose when the pump starts pulling.

[ihenson711]

Alright I will try to look that up.. Do you know what the common problems are with the TPS.. and maybe what the symptoms are? Also can I just remove the throttle body assembly and clean the TPS.. because I'm not getting any CES lights. In regards to the gas tank do you have any recommendations as far as cleaning it out, and making sure that I can get everything out.

thanks in advance..

[nametakennow]

You could try cleaning it. Hesitation, surging, and idle issues are common TPS indicators.

As for the fuel tank, syphon out the gas and use a cloth with some carb cleaner to get the gunk out. If there are large particles, you could vacuum them out (and no, the vac won't explode, Mythbusters tested that).

[ihenson711]

Well I decided to take the pump assembly out again tonight because the car was running rough today and it was pretty clean. I cleaned it put it back together and dorve the car about 4 miles or so and the car ran great. Do you know if the fuel pressure regulator is actually built into the pump, or is there a regulator somewhere else on the car? My dad said that with GM cars there is a pressure regulator on the fuel rail, and there is also a fuel return line that sends unused fuel back to the tank. Any thoughts? I am pretty darn sure that my problem lies within the fuel system.

[nametakennow]

The FPR is on the fuel rail. There is no fuel return.

Since every time you clean the pump it runs great for awhile, it sounds like it has to be a dirty tank.

[ihenson711]

Is there a chance that the pump could be running at the wrong pressure.. Because the car ran pretty crappy yesterday, and when I pulled the pump there wasnt really anything in there. Do you think there is a chance that enough small particles got through the screen and maybee into the pump itself causing the pump to have the wrong pressure.. Just Fishin. Also to when I pulled the fuel rail off to clean the injectors I didnt see any type of fuel pressure regulator.
Modified by ihenson711 at 11:47 AM 3/6/2008

[nametakennow]

Here's the FPR:edit: I was thinking 2.0, sorry. It may be on the pump, I can't seem to find an answer to where it is on the SE-Rs. Seems like they're all the same, but that might be wrong.

It is possible that the pump itself got messed up. Thing is, since cleaning the tank is going to be cheaper than replacing the pump, I figured you could try that first.

[ihenson711]

Do you know how exactly you would clean the TPS. I took the throttle body off and I assume that the TPS is the large black plastic housing with an electrical connection that is attached to the back of it... the only problem is I dont see a way to clean it. The only way that I see that I could get in to the TPS is to drill out the 4 rivots that are holding the plastic shell on to the TB. Has anyone done this on a 02 spec v..

http://i16.ebayimg.com/07/i/000/86/14/4 ... 34ac_1.JPG

Here is a pic of what it looks like..... Any Ideas.
Modified by ihenson711 at 8:40 AM 3/9/2008

[nametakennow]

You could try separating the metal portion from the black plastic.

However, remembering that the QR has an electronic throttle, it may be that the TPS merely takes how far the pedal is in and adjusts a resistance signal to the ECU, rather than checking any mechanical aspect (as with a throttle cable).