garydevine

Sorry just had too many guesses.

ok heres everythin a think you need to know

Subaru rb5

maf replaced 5 months ago
turbo replaced 3 months ago.

Car starts begins to idle but then starts popin and banging. no engine management light. tried to rev the car it just pops in bangs. revs go mega low. unplug the maf i am able to drive the car,

hes a short video. tried switching dumpvalves with a car a know that works.


[quote="Garydevine"]

TonyBurns

iTrader: (3)

Okaaaaaay, so its slightly modified, can we have a list of what has been done to the car, remapped, fmic, ecu used etc?

Tony

prodriverules

iTrader: (52)

It seems like your idle speed control valve isn't working mate which is why it picks up in rev's when you pull off the dump valve allowing more air into the system.

KAS35RSTI

iTrader: (73)

The car should stall if you unplug the maf. Sounds like another dodgy maf but it can be alot of other things. Unless you got anti lag which you dont know about

quattroowner

iTrader: (5)

Hey mate..

mine's had a similar problem..what condition is the icv in..as mine started idling everywere and got mine cleaned out and new o seal's and it idle's alot better..did that today infact. might help?..No leak's in boost piper or inlet?

TonyBurns

iTrader: (3)

I would tend to agree with you, but there looks to be quite a few modifications to this car which the OP has failed to mention, and we also need to know if the maf was new or not...

Dont provide all the information, dont expect to get an answer thats near close to the issue....

Tony

quattroowner

iTrader: (5)

Mine stall's when i unplug the maf...

Try a good clean with brake cleaner and soak the o ring's for a second ..then lt it dry off.. it help sort mine out...btw it's gingerscoob of scottishscoobies

prodriverules

iTrader: (52)

+1 on that Tony,it certainly would help things alot.

lomas the great

sounds just like mine when i fitted a fmic with out having it mapped.

garydevine

sorry never mentioned a few things

ok Forged internels,fmic.... cars not mapped. however ive been running this setup for months without any issues.

the MAF. was new yes!

garydevine

also. car will not rev atal!! unless mafs unplugged.

f4la k

iTrader: (1)

I dont know where people have got the information about unplugging the maf when the car is running, but this is not advisable to do.

scooby2010

sounds like ur maf 2me

KAS35RSTI

iTrader: (73)

Regardless of that it should not run if unplugged.

garydevine

if the cars running and i unplug the maf the car cuts out. however a can start the car from that. apparently the car uses something else when you unplug the maf.

rapid.STI

iTrader: (5)

looks like you have a baileys d/v which ive heard are known for failing, i had exactly the same issue with my98 classic. took dumpvalve off(although mine is blitz) stripped, cleaned, sealed up and lubed the piston on it, refitted and hey presto.

worth a try! its free.

L.J.F

iTrader: (31)

I would suggest you replace the maf and get it booked in for mapping and try not to use it til then mate. The mixture will be all over the place and the car is over compensating with fuel, eventually you will end up melting it

joz8968

iTrader: (13)

First, and logical, step would be checking for fault codes stored in the ECU (if any).

It may pinpoint the offending item... Or at least point you down the right road for diagnosis...

r1c

iTrader: (9)

What turbo are you running? Tbh I personally think You won't get a diagnosis over the Internet. You need to take it to a specialist. Your only gonna get people guessing

garydevine

hi again.

i am running standard turbo a td04. i have swapped my dumpvalve over with another classic so the dumpvalve is not an issue.

the car was plugged into the global obd and it couldnt pick the car up. i dont know why.

i have tried the plugs underneath the car and came back with no faults.

r1c

iTrader: (9)

Seek advise from a specialist mate. It's near on impossible to say all we can do is guess!
Get your wallet out!!!!

joz8968

iTrader: (13)

Re 'OBD' port - I don't think it's OBD protocol. The software you were using prob didn't speak the same language?

Contact Splitpin - he knows all about it and will put you right on the MY97/98 comms port.........

deanb1980

firstly was the maf genuine or micky mouse and secondly you should get it mapped straight away this is a must you are just gonna keep guessing. get the re map done then you know everything is as it should be plus the mapper if decent will know where to start with your problem if it continues

r1c

iTrader: (9)

An obd reader is no good as your before 2001 where e

Brun

Not much use for an RB5

joz8968

iTrader: (13)

LOL only just seen that in his 1st post! That'll be a MY99 then.

It therefore just sees the ECU via SSM protocol

OP would need a ISO9141 cable and EcuExplorer software, then...

Brun

r1c

iTrader: (9)

eeeeee... ****ing laptop!!!
as said, code reader is no good!! black plugs will do the same thing.

Jolly Green Monster

iTrader: (4)

I would say maf or dump valve is open/failed or an intercooler pipe is leaking.

the old maf unplug and it should stall is completely rubbish and proves nothing.
Someone mentioned it years ago on here and people have just continued this myth without logic.

Simon

Jolly Green Monster

iTrader: (4)

check the help pages on my website www.jollygreenmonster.co.uk to read the error codes using the connectors under the dash.

Simon