What kind of MAF is this...

[youngun21a]

So after I adjusted my TPS to .50v is ran fine the only hesitation was on take off when i punch it..but after that it was fine so 2 days ago it started doing it again it started to backfire and fall flat in face when i gave it gas..or if i was at a constant speed it will skip or miss or hesitate can't really the the diffrence...so no code only 34 but had that since i had the car..so i took out the MAF to clean and was WTF!!! How do I clean this the only thing or name next to it was Jecs and Nissan and Made in Japan.. after that I took one spark plug out they all look the same... look like is running rich or what...car starts fine on the first try..so before this I bought new spark plugs and wires,cap and rotor,o2 sensor...only thing that comes to mind is bad timing on the cams...

[thrasherx89]

you clean the maf with maf cleaner you can get from the auto store, good stuff

if the car is back firing then yes it would probably be running rich seeing as backfiring is detonation of burnt fuel in the exhaust

if you replaced your ignition stuff its probably an ignition timing problem

[youngun21a]

ain't the maf suppost to have a screen or a sensor in the middle or is it like that..there nothing wrong with it i uplug the sensor and the car shuts off..don't know why i can't get my cams timing right I follow the jim wolf and still no luck,guess i have to do it again...

[thrasherx89]

yeah its suppose to have a little sensor in it

easiest thing to do would to be to go to the wreckers and get one or to borrow a friends to a testing of the maf.

if you already started messing with the cams thats a bummer i got into a huge mess that way

that diagram sucks and the only explanation i have for it is that the cams are for the jim wolf cams soooooo...

use a long, straight item to put into the cylinder threw the spark plug oppening on cylinder #1

turn the engine over at the crank, uses a pretty big socket around 30mm

turn it until you see the item at the top most point and bottom it out (tdc), can mark the item if you want it to be easier

unto the timing sprokets and either by turning the cams or by removing the brackets and laying them back in close and re tightening the brackets

set the intake cam to being its intake cycle or the first lobe is about to press down on the valve spring cap. (right side)

the exhaust cam should be exiting its exhast cycle so it should be about to touch the valve spring cap (left side)

put the sprokets back on and the chain, moving the cams a little bit to make the chain go on easier might be required.

good luck

[ward28465]

There are several different types of MAF. I THINK all 240 are "hot wire" MAF which in your case i dont see the wire. Also when you are working on timing. you need to becareful as the "stick something in the spark plug hole" trick can be confusing. You will find there are 2 TDC (compression/exhaust) and you need to make sure you are on the correct one.

[thrasherx89]

haha yeah i did forget about that, it would be either on or 180 degrees off, if it is you could mess something up so try turning it over all the way at the crank

is their any other way of adjusting the cam timing when you dont know the cycle it is on?

cause this is the only way i know

[moso]

take the air filter off and the 4 screws on the side in the photo (you can see 2 screws in the first photo) you can get to the hotwire that way.

[youngun21a]

I have the first piston on tdc,and i have the cams like this....test a new maf from a friend and did the same thing also check the injectors and ecu with a diffrent one and still the same so i'm guessing is still the cams..dont think i bent any valves or it wouldn't run at all..should i bring the TPS down to .45v or should i leave it at .50v..also coolant sensor is new..also when it's cold i have to wait a little to leave cause it hesitats and it dies...

[toofortaysex]

Thats not a MAF, thats an alien!

but seriously... i had the same problem, but oddly enough my battery post had broken off and was wobbling around, which was somehow causing my TPS to screw up.... not your problem most likely but

[youngun21a]

my TPS stay at .50v constant and only code 34...i redid the cams and all is good no hesitation,like before when i was at a light or park and just did a fast rev and will fall flat on it face and backfire..and now it don't backfire when i press it only after i let it go i can hear it...but it does run way better than before so i'm thinking maybe add some ground rebuy new sparkplugs and wires....and see how it goes...

[VRoy]

On the MAF for the DE there is two holes, the sensor it self is in the little hole. Quick tip to know what cycle your motor is on. Put a cotton ball in the spark plug hole and turn the motor over, when it blows out, your on the compression stroke. Also your crank pulley should have the OEM notchs on it. You may not see them but a little elbow grease never killed anyone, they are there

[youngun21a]

So got new sparkplugs and new wires today, and did an oil change too.and still does the same thing when i left go of the gas backfire..so going to mess with the dizzy and see how that goes tomorow..and if i stay at a constant speed it will skip like if I let go of the gas..so will see..

[liquid_cool]

There are several different types of MAF. I THINK all 240 are "hot wire" MAF which in your case i dont see the wire. Also when you are working on timing. you need to becareful as the "stick something in the spark plug hole" trick can be confusing. You will find there are 2 TDC (compression/exhaust) and you need to make sure you are on the correct one.

no offence ward..but this is a confusing statement...

#1.) your a duel OVERHEAD cam engine...the #1 cylinder at TDC dosent know if its an exaust stroke or compretion stroke..it makes no difference as the valves are controlled by the cams once there set..so any TDC position works for setting the timing....and all tdc strokes when no cams are in place will act like a compretion stroke due to the valves being closed...

If you know how to find TDC..then the timing is easy...whats probly messin ya up..is the slack in the chain that the tentioner takes up when oil presure is applyed to it..its probly makin ya off by 1 tooth..you might try to take the slack off the chain where the tentioner is and see how the chain looks to you then..good luck.

[liquid_cool]

I have the first piston on tdc,and i have the cams like this....test a new maf from a friend and did the same thing also check the injectors and ecu with a diffrent one and still the same so i'm guessing is still the cams..dont think i bent any valves or it wouldn't run at all..should i bring the TPS down to .45v or should i leave it at .50v..also coolant sensor is new..also when it's cold i have to wait a little to leave cause it hesitats and it dies...

this dosent look rite to me in this pic...can you take another pic more looking down....allso..in the center inbetween your cam sprockets WAS a chain guide...you might want to remove what left of it..looks like it broke off a while ago.

[VRoy]

^^ just noticed that. Out of three heads i have done, two of them had the same guide broken. i would also like to see a top down shot, so i can see where you have the first set of lobes at. Also which cams are they?

[youngun21a]

First shot with TDC...Pully..Second shot with TDCPullySparkPlug after a day and half of use..

[youngun21a]

Forgot to add First shot..Second Shot

[VRoy]

Your second picture looks right, the first two lobes should be pointing away from each other at TDC. Sounds like you just need to play with the dizzy some more, it took us quite a few times to get it right on a friends. Trial and Error until we finally got it right. Check this out also zerothread/357786

[youngun21a]

Yeah the first pic i rotated to TDC then I rotated again to TDC with out removing the cams just did another rotation..So if i'm on the exhaust side will it still backfire,i know i need to be on the compration side..just crossing T's..and keep messing with the dizzy..and see how it goes tomorow...

[youngun21a]

No luck still does the same thing...Can't give up...

[youngun21a]

FINALLY FIX!!!!!!It was the spark plug wire on cyl 3 it was torn in the middle the weird thing was that the spark plug wires where new. all well live and learn...