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new engine issue- fuel cut ?
Posted: Sat Feb 04, 2012 11:01 am
by elitee
Hi,
Just replaced the engine in my NB8a everything is fine expect when driving, it wont rev past 3-4k rpm in any gear, seems like there is a fuel cut happening.
Could this be due to timing or air fuel ratio running to rich ?
Is there anything i can check.
thanks,
Robert
Re: new engine issue- fuel cut ?
Posted: Sat Feb 04, 2012 11:20 am
by 93_Clubman
Are you certain the plug leads are good?
If so, is the replacement motor out of an NB8A, i.e. 1998-2000 with BP4W cast on back of head? NB8A uses an intake manifold which incorporates VICS.
Btw, what engine management are you using, i.e. OEM ECU or aftermarket?
Re: new engine issue- fuel cut ?
Posted: Sat Feb 04, 2012 11:27 am
by elitee
93_Clubman wrote:Are you certain the plug leads are good?
If so, is the replacement motor out of an NB8A, i.e. 1998-2000 with BP4W cast on back of head? NB8A uses an intake manifold which incorporates VICS.
Btw, what engine management are you using, i.e. OEM ECU or aftermarket?
Im not to sure about the plug leads, do have new ones here may need to put them on and see how they go.
Yes its a 1999 bp4w, i am running a OEM ecu
Re: new engine issue- fuel cut ?
Posted: Sat Feb 04, 2012 12:37 pm
by 93_Clubman
elitee wrote:93_Clubman wrote:Are you certain the plug leads are good?
If so, is the replacement motor out of an NB8A, i.e. 1998-2000 with BP4W cast on back of head? NB8A uses an intake manifold which incorporates VICS.
Btw, what engine management are you using, i.e. OEM ECU or aftermarket?
Im not to sure about the plug leads, do have new ones here may need to put them on and see how they go.
Yes its a 1999 bp4w, i am running a OEM ecu
And it's got the NB8A VICS intake manifold?
Re: new engine issue- fuel cut ?
Posted: Sat Feb 04, 2012 12:41 pm
by 93_Clubman
The other common NB8A weakness is coilpacks - so also worth confirming these are good.