Crank angle sensor out of phase?

[koachworks]

I read in a Chilton's manual that the installation of the crank angle sensor should line up with the dowel on the cam sprocket after a cam change. I recently installed a set of 264/272 cams on my 92 GVR4 and am now getting detonation at only 15 psi of boost. The cams were installed straight up and i never got detonation before when i was using the stock cams. I may have accidentally moved the crank angle sensor while performing the cam change and may have installed it out of phase. Could that be the cause of detonation? my timing is set at 5 degrees. no boost leaks, 255 lph rewired fuel pump, 510 cc injectors, b&m adjustable fuel pressure, 16g, 2g maf, 3" exhaust, hks fmic, upgraded intercooler pipes, mines ecu.

I used to boost 18 psi with no problems. What am i overlooking here?

 

[oldman]

1. Not related to the problem at hand but you have fpr overrun, the B&M fpr was a waste of money.

2. What are you using to tune the 2G mas/510s?

 

[97gstnick]

Check your base timing. If thats good, sounds like you need to retune for those cams which should have been done anyway.

 

[koachworks]

Oldman, thanks for the advice re the b&m regulator. it's time to change it then.
i'm using a 1st gen. field simple fuel controller to tune the 2nd gen. mas and 510's. so going back to my question, is there a possibility that the crank angle sensor is out of phase?

97gstnick, base timing is 5 degrees. retune as in cam timing?

 

[97gstnick]

Retune as in make some ecu changes for the cams. You flowing more air and it should be compensated for with fuel and possibly timing changes.

 

[oldman]

so going back to my question, is there a possibility that the crank angle sensor is out of phase?

I don't know if it will cause knock but it will make your car stumble because the injectors are firing at the wrong time, put the motor in TDC and pull the CAS to double check, make sure you properly set the ignition base timing back to 5* BTDC. Have you double check valve timing after the CAM install? Have you tried adding some fuel to see if knock goes away?

 

[steve]

going back to my question, is there a possibility that the crank angle sensor is out of phase?

97gstnick, base timing is 5 degrees. retune as in cam timing?

If you have checked your timing with a light and it's 5* BTDC and made sure that the timing mark on the harmonic dampner (Crank Pully) haven't shifted, then you've covered two of three checks to answer your question. Unless you have a way to compare the injector firing sequence you need to turn the engine over to TDC cylinder 1 and pop the CAS out to see if it's phased correctly or 180* out. If it's correct the timing marks on it will line up.

Steve

 

[koachworks]

Oldman, Steve & 97gstnick, timing is 5*BTDC so that's not the problem. I haven't checked cam timing yet. will do that asap. fuel is 96 octane. car isn't stumbling. guys, i'll set it at tdc and check phasing of the cas. will info you on my findings. again thanks so much for taking the time to help me out.

 

[Talesin]

Huh. That Field SFC looks like it's designed to be a VTEC controller. But if it was working before and things are having issues now, look at the last things that changed.

It's very easy to mis-align the timing marks.. make sure you put a straightedge through the middle of the cam gear bolts to check the timing marks. I've had two professional mechanics install my t-belt with between a tooth and three off, because they felt that eyeballing it was good enough, despite telling them before they even started to use a damn straightedge to make sure.

 

[97gstnick]

Also, how do you datalog? How are you able to see your getting detonation and what is it in? knock count? timing pulled?

 

[oldman]

Also, how do you datalog? How are you able to see your getting detonation and what is it in? knock count? timing pulled?

Just because a 2G logger sucks doesn't mean all loggers suck.

 

[koachworks]

Talesin, the field SFC is a 1st gen fuel controller only. It was bought pre vtec era. I bought it from VIS years back. I'll have the timing marks checked and double checked again. Thanks for the advice.

97gstnick, sadly i don't have a data logger. I'm getting detonation cause i can very clearly hear it.

Being from the Philippines means that it's not that easy to purchase some parts. I'll be doing what you gentlemen have advised me and will keep you updated. Again, many thanks.

 

[Talesin]

Ah, had never really heard of the Field SFC before, why I was asking. Everyone around here just runs an Apex SAFC/II, a prefab chip, DSMLink, or those with deep pockets spring for the headache and potential of an AEM EMS or HALTECH.

And yeah, it can really look like the marks are on if all you have are the marks and the cam gears as a visual reference.

 

[97gstnick]

Just because a 2G logger sucks doesn't mean all loggers suck.

I was asking him because I'm not sure what he uses to tune. He could have dsmlink for all I know, but just not listed in his profile. That being the reason I asked.

 

[oldman]

I was asking him because I'm not sure what he uses to tune. He could have dsmlink for all I know, but just not listed in his profile. That being the reason I asked.

I thought you asked because 2G loggers can't read knock.