My 350 is running horrible

[Nisssanchris]

Hello has anyone got any ideas,  I've tried all the usual things.

 

I was out in my 2004 350z, It was running fine nothing wrong with it. as I came into a village an I slowed down  As I came out the village put my foot down and it ran horrible. 

 

Its sound like its a misfire but not misfire its running rough no power. No engine light is on an no codes are stored, It's had new spark plugs new coil packs new injectors and the solenoids have been cleaned out no change. And I've done a compression test on it The biggest difference across the 6 cylinders is 10PSI,  I've also check for vacuum leaks, Fuel pump is OK. 

 

I work with cars myself but I've never come across this.

[ZMANALEX]

What cyl/cyls are giving you the issue?

[Nisssanchris]

Hi 

Unsure if its even a cylinder that is at fault,  All coils are firing, If I was to run it on 5 coil packs And do this across all 6 cylinders, disconnecting one at a time all the cylinders sound the same. 

 

It's almost like the timings out. When warm it idles at 600 rpm

 

It's hard with no engine codes 

 

On a american website  Someone said It could be the cam sensors, but I'm not a fan of guessing.

 

 

[ZMANALEX]

Okay in that case get it on a diagnostic machine preferably with a 350Z specialist who has Consult.

 

It could be a cam sensor, crank sensor, timing chain, VVT sprocket: etc etc atc.

 

Have you tried any of the resets?

 

Where are you based?

 

Plenty fully working preowned engine parts in stock if required:   https://www.350z-uk.com/topic/125665-loadsa-parts-for-sale-picture-heavy-now-with-prices-and-detail/

 

 

 

 

[G1en]

Just had something similar to what you describe with mine. Took it to horsham and they diagnosed it (i may get this wrong) as a sticking valve? To do with the variable valve timing that connects to the end of the camshafts, they said it was fairly common and when it sticks the revs can drop then the cams are out of timing and the ecu tries to sort everything out resulting in the stuttering and loss of power and what seems like mis-firing. 
Good news is they mapped 90% of the issue out and my car drives much better now with all the power i had previously plus 2bhp more. 
bad news is a new replacement vvt bit costs £1000 upwards if i decide to “cure” the issue rather than mask it. I have probably explained that all wrong but like Alex says, one of the traders/tuners on here will be able to tell you the exact issue if you pay them a visit, does sound exactly like my issue though. 

[ZMANALEX]

Plenty fully working VVT units in stock and only £100.00 each.

 

As Glen has said, these are over £1000.00 each from Nissan

 

[G1en]

Thats good to know Alex, its those round toothed parts at the bottom of the picture i think is my issue and what i was referring to above. 
Do you have any for a HR?

think a HR has one for both intake and exhaust side where as the DE is just intake. 
not sure which one i need or if i need both?

[Nisssanchris]

I've tried to ECU reset and the throttle reset, and its had a new maf.

 

Im in the west Midlands.

 

Oh yer I've used that before

 

Thanks

 

 

 

 

[Nisssanchris]

39 minutes ago, G1en said:

Just had something similar to what you describe with mine. Took it to horsham and they diagnosed it (i may get this wrong) as a sticking valve? To do with the variable valve timing that connects to the end of the camshafts, they said it was fairly common and when it sticks the revs can drop then the cams are out of timing and the ecu tries to sort everything out resulting in the stuttering and loss of power and what seems like mis-firing. 
Good news is they mapped 90% of the issue out and my car drives much better now with all the power i had previously plus 2bhp more. 
bad news is a new replacement vvt bit costs £1000 upwards if i decide to “cure” the issue rather than mask it. I have probably explained that all wrong but like Alex says, one of the traders/tuners on here will be able to tell you the exact issue if you pay them a visit, does sound exactly like my issue though. 

Hi yer thanks that sounds like what's going on, did you get any codes or engine light 

Thanks for your help

 

[G1en]

No codes or engine light like you. Only happened when i was tootling along then floored the accelerator, it felt like the ecu didnt know what Fuel/air to use car spluttered for a second or two then the power got fed in, didnt do it when you slowly fed the power in although it did feel lacking on power overall. I started a thread on here recently with video attached. At idle and keeping foot on accelerator at 10/20% the revs slowly climb to 2k then drop before increasing again, you could check to see if yours does this. As i said above though, the remap has sorted mine and my issue was made worse by having tomei cams and new high flow cats. Goods news is Alex can save you a fortune on whichever part you may need if you go down the used replacement option. 

[ZMANALEX]

45 minutes ago, G1en said:

Thats good to know Alex, its those round toothed parts at the bottom of the picture i think is my issue and what i was referring to above. 
Do you have any for a HR?

think a HR has one for both intake and exhaust side where as the DE is just intake. 
not sure which one i need or if i need both?

Yes, HR in stock Glen.

 

You are correct the HR and the rev up DE has VVT for both intake and exhaust.

[Nisssanchris]

On 26/06/2020 at 21:11, ZMANALEX said:

Plenty fully working VVT units in stock and only £100.00 each.

 

As Glen has said, these are over £1000.00 each from Nissan

 

OK well mate I'm going to have a look into that, also my mates the lightest snap on diagnostics scan tool going to try it see if anything else comes up , you do more with it. My scanner is cheap mac tools one cost about £80 only really good for reading in deleting codes, So I will get back to you if need any parts.

Thanks for your help