JdcTypeR

iTrader: (19)

Hello, Im hoping someone can help i Have a 98 type r and it hesitates-misfires from cold between 1000 and 3000 rpm. Ive disconnected the 02 sensor and it still does it. Ive changed the 02 sensor twice (bosch) , the maf once, fitted plugs a few times ( NGK 7Bs) and again tonight still the same. Also i get a miss on idle every now and then which you can here popping through the exhaust mainly when warm. Ive just bought an apexi pfc and i want to get it mapped but i would like to sort this fault out beforehand just incase it may cause a problem. The car is standard over than a decat exhaust system and a green panel filter.
Cheers

James

chrisUK300

iTrader: (10)

coil packs in good condition?

stewby2202

Have you had timing belt replaced or pulleys changed, get your timing checked , Disconnecting your 02 will cause more problems and remap is required after decat so get that sorted then go from there.

JdcTypeR

iTrader: (19)

Ive got the single coil pack,No signs of arcing, Is there a way to test it?
Cheers

James

nixxon

Have you always fitted the same plugs? Are they too hard? What gap? Have you tried closing it up a bit?

JdcTypeR

iTrader: (19)

Cheers for the reply Stewby/nixxon. the belt was changed before i got the car over 3 years ago and ive checked the timing and all was ok. I only disconnected the 02 sensor as a test to try and rule it out.

Ive tried various plugs NGK6Bs, NGK7BS and NGK7G now back to 7Bs gapped to .65 mm

Cheers
James

JdcTypeR

iTrader: (19)

Does anybody know what the manifold vaccum and the fuel pressure should be please.
cheers
james

joz8968

iTrader: (13)

With the vacuum hose off of the FPR, then it should be at 3bar/44psi. Drops to about 2.6bar when connected.

JdcTypeR

iTrader: (19)

Cheers for that joz8968, ive just got to get a pressure gauge to test it with. I did a manifold vacuum test today and vacuum was good between 17 and 21 in hg which i think is normal but the gauge started to flicker. i did a search on readings and says that the plug gap is too small i set them to 0.65mm and previously 0.7mm, what does everyone else set them to.

Cheers
James

joz8968

iTrader: (13)

If you have new coilpacks, or know them to be working perfectly, then 0.7mm

If you're unsure, then your 0.65mm should be fine. Could go to 0.6mm to be sure though.