HELP! Severe acceleration lag

juld0zer · 07-30-2014, 03:29 AM

i got my car back from the dealer.
i had a list lf warranty issues to fix:
- boot doesnt release on first press (new hatch springs fitted)
- boot struts provide little assistance at upper half of travel (new struts fitted)
- ac/volume controls are jittery (control panel backordered from japan)
- clutch fluid disappearing (slave cyl replaced)
- severe lag when at operating temp...

i took the tech for a test drive when i picked up the car. they blamed my stillen intakes but i argued. they said the cam and crank sensors are fine even though i pointed them to the exact page in the service manual.

the fault did occur during the test drive. tech tried to mask it by demonstrating that it 'is normal' by driving aggressively (launching at 2500-3000+ rpm and keeping revs above mid range). i pointed this out that the car shouldnt have to be driven like that all the time. he took the car into the workshop and brought it back out for me to drive home and monitor its progress.

i have to say, whatever happened in the workshop prior to me taking the car home seems to have cured it. i cant seem to make it happen. i've crawled home thru traffic a few times, driven it hard and gently. so far so good. rpm still sags to 500rpm at idle sometimes.

as for the slave cyl, my clutch feels better than the day i picked up the car 2nd hand with 15000km on the clock! pedal is heavier but has more feel. gearshifts are really smooth. 1st to 2nd no longer clunks. rev match is pretty much flawless.

let's see how she goes

P's_Z · 07-30-2014, 06:21 AM

Good for you juld0zer! I should be taking mine in sometime the following week, things at work have been hectic but hopefully i can get Monday off.

juld0zer · 08-05-2014, 03:58 AM

looks like my joy was short lived. it was inevitable that the issue would eventually resurface but now it is more difficult to reproduce and it will occur in unpredictable circumstances. before i took it in, it would happen pretty much within 25mins of casual driving from the first start of the day.

so far i've had it happen mainly after driving for about 35mins or more, or whenever the coolant temp stays above 90*c for a while. but there was one time during a 1.5 non stop drive including heavy traffic crawling where the lag did not occur at all!! so that occurrence certainly makes my temperature related theory a bit muddy.

i was due for an oil change today. changed the oil to Valvoline 5w30 MST with the same model mobil 1 filter (108). Prior, i was running Nulon 5w40. viscosity is important for the VVT solenoid function so if Nissan designed the engine for 5w30 worldwide, i will run 5w30 until the issue is sorted (got lots of 0w40 and 5w40 at home)

07-30-2014, 06:21 AM	#2 (permalink)
P's_Z A True Z Fanatic Join Date: Apr 2013 Location: PR Posts: 1,530 Drives: Zeta Rep Power: 471	Good for you juld0zer! I should be taking mine in sometime the following week, things at work have been hectic but hopefully i can get Monday off. __________________ Zeta

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07-30-2014, 03:29 AM	#1 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 140	i got my car back from the dealer. i had a list lf warranty issues to fix: - boot doesnt release on first press (new hatch springs fitted) - boot struts provide little assistance at upper half of travel (new struts fitted) - ac/volume controls are jittery (control panel backordered from japan) - clutch fluid disappearing (slave cyl replaced) - severe lag when at operating temp... i took the tech for a test drive when i picked up the car. they blamed my stillen intakes but i argued. they said the cam and crank sensors are fine even though i pointed them to the exact page in the service manual. the fault did occur during the test drive. tech tried to mask it by demonstrating that it 'is normal' by driving aggressively (launching at 2500-3000+ rpm and keeping revs above mid range). i pointed this out that the car shouldnt have to be driven like that all the time. he took the car into the workshop and brought it back out for me to drive home and monitor its progress. i have to say, whatever happened in the workshop prior to me taking the car home seems to have cured it. i cant seem to make it happen. i've crawled home thru traffic a few times, driven it hard and gently. so far so good. rpm still sags to 500rpm at idle sometimes. as for the slave cyl, my clutch feels better than the day i picked up the car 2nd hand with 15000km on the clock! pedal is heavier but has more feel. gearshifts are really smooth. 1st to 2nd no longer clunks. rev match is pretty much flawless. let's see how she goes

08-05-2014, 03:58 AM	#3 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 140	looks like my joy was short lived. it was inevitable that the issue would eventually resurface but now it is more difficult to reproduce and it will occur in unpredictable circumstances. before i took it in, it would happen pretty much within 25mins of casual driving from the first start of the day. so far i've had it happen mainly after driving for about 35mins or more, or whenever the coolant temp stays above 90*c for a while. but there was one time during a 1.5 non stop drive including heavy traffic crawling where the lag did not occur at all!! so that occurrence certainly makes my temperature related theory a bit muddy. i was due for an oil change today. changed the oil to Valvoline 5w30 MST with the same model mobil 1 filter (108). Prior, i was running Nulon 5w40. viscosity is important for the VVT solenoid function so if Nissan designed the engine for 5w30 worldwide, i will run 5w30 until the issue is sorted (got lots of 0w40 and 5w40 at home)