Note: I have done several searches and found little conclusive in regards to my issue.

 

I have a 1990 Jspec 300zx which I just finnished importing from the UK to Canada. It's been an amazing car except in thunder storms and when it's insanely humid out. I understand that it gets way more humid Canada than the UK. I was getting a code 12 @ one point (MAF) but that went away when I sprayed the MAF connector w/ dampening and water sealant sprays. I am now getting no codes but it still missfires/bogs down whenever the humidity is above 75% while it's above 25 C outside.

 

Here's all of the issues:

1) It will not hold idle w/o me holding my foot on the excelerator when I am stationary.

2) If I attempt to accelerate above 2900RPM, I get a crazy missfire.

3) When I accelerate my boost gauge barely moves above 0.

4) Sometimes it helps by turning off the car and turning it back on right away.

 

Any help would be much appreciated...Cheers in advance.

Still sounds like a MAF issue. When the MAF fails the engine won't go past 2500'ish. Try a new one perhaps to rule it out.

Still sounds like a MAF issue. When the MAF fails the engine won't go past 2500'ish. Try a new one perhaps to rule it out.

Cheers Mate

 

any suggestions of UK websites who carry 300zx pts? I have already checked @ my local Nissan Dealership and the want 400pounds for a new one if they can even order it since they say it's discontinued

Don't know about Canada but if you check our traders' forum here you will see a bunch. Plus two well known US ones are http://www.conceptzperformance.com/ and http://www.courtesyparts.com/

Are you running a stock filter/intake?

and looky here http://www.300zx.co.uk/forums/showthread.php?t=96178

Are you running a stock filter/intake?

my thoughts too. is your filter the standard panel or is it an aftermarket cone filter? if this gets wet then you get running problems, although more similar to 4-cylinders.

Are you running a stock filter/intake?

I am running a K&N cone filter.

You're sucking water into the filter then. I remember a chap on here (Royal) had the same problems with his Z in heavy rain. Safety boosting and juddering.

 

Try refitting the original airbox to see if it makes any difference.

make a filter shield out of a bucket and fasten found your filter, mine had probs with water and this solved it.

After listening to all of your advice, I decided to take the grill off and check out the MAF again. Well, u guessed it! The MAF is actually functioning properly (thank God) and the Filter was somewhat wet. After leaving the MAF and filter out in the 30 C sun for an hour, they seemed to dry out and after reattaching them, the car works perfect again.

 

PS: I am really liking my decision to switch from Honda to Nissan!

a few solutions to your problem, fit standard airbox, fit a filter shield for heavy rain and use a cone filter that requires oiling to reduce the affects of high humidity, fit a enclosed induction kit.

I completely forgot to abut oiling the Apexi filter...I will do that 1st thing in the morning. The filter did look like it had been cleaned prior to its departure from the UK. My guess is that the last person who cleaned it neglected to oil it.

 

cheers to everybody for all of your insight. As I said b4, u people are way more helpful than the blokes I was dealing w/ on the Honda forums. There just seems to be so level of maturity amongst nissan owners.