Timing Problem RB25DET

[b1ks14]

Cam sensor is all the way advanced but timing still reads slightly retarded. Boggs once and a while and the car runs really lean. I have to richen up the fuel a lot just to start. If anyone can help i would really appreciate it. Thanks

[Carl H]

huh?how are you checking timing, i hope you have a light on it........super advanced timing will make the car run lean.

[Joe]

seriously, a ton more details are needed for this one.

retard = richadvance = lean

how do you know you are running eithre? please give us full details on your setup and we can help better.

[b1ks14]

A timing light was used. Timing was slightly retarded but the cas was advanced all the way. The rb25 was recently installed. I have pretty much everything stock with the exception of a greddy intake manifold, metal head gasket, boost controller, fuel controller, fmt intercooler, and fuel pump. I had to increase the fuel by 20 units on my Apexi SAFC to run right. If i put the settings at stock than it boggs big time. I'm only boostin 10 lbs. on a stock turbo. If I try to adjust the cas more towards the center than it won't rev past 5000 rpms. Aside from the bogging the engine feels smooth but not really powerful. I had an SR before this and it felt a whole lot better. Do you think i might have a bad cas or maf?

[Carl H]

you still arnt telling us the most important part the NUMBERS!what i do when i set timing is unplug the battery, set the cas to the 'middle' position and reset the ecuthen i time the car as manual specifies, and go for a spirited drive to let the car learn my driving charcteristics.

[eh?]

i'm guessing you didn't pull the TPS plug?

[b1ks14]

That is what i did but the timing mark on the crank pully read that the timin was really retarded when the cas was set in the "middle". I preceeded to adjust the cas so that the timing mark on the crank pully was set to as close to stock spec as i could get it. I did pull the tps plug.

[eh?]

What is it reading?

[b1ks14]

from what i could see. it was reading 1 maybe 2 degrees retarded. the cas could not be advanced any more. should I try out another cas?

[USMCgetsome]

NO SIR!!!!!!! Take off the timing belt cover and rotate the crank pulley untill the intake and exhaust cams align to the 2 dots on the back of the timing cover. I had this exact same problem and it ended up being that my belt had slipped a tooth on the exhaust side and my engine ran like *** for months untill the guys on this board helped me figure it out. Start there.

[b1ks14]

I was afraid that might also be the problem. even though u had that problem, did your car run like **** all the time or only some times? i'll check the timing belt and see if it might had slipped. thanks

[blues14]

i am having this problem on my rb20. the shop that set my timing said the car feels like its "a tooth off" . advancing the cas did fix my problem, but i really should check the gears. does anybody have some sort of diagram of what i need to look for after removing the cam cover?

[eh?]

Take off the uppr timing belt cover to expose the camgears. On the sides of the back plate you will see two marks. On each cam you will see a dot. rotate the crank until each of those dots align. Then look at the crank pully, the orange timing mark will align with a mark on the lower timing cover that is about at 2 o'clock.ref: http://www.livesockets.com/quo...x.htmh ... .x.htmgood site.

[b1ks14]

I checked the timing belt and unfortunately everthing looks good. So I have replaced the cas sensor and so far everything is running good. I do get a lil hesitation once and a while but at least the timing readings are normal. I am gonna try to re-gap the spark plugs to see if that will get rid of the hesitation. Appreciate all of ur help and i hope this will help out someone in the future.

[eh?]

So it was a bad CAS?

[b1ks14]

For the most part yes it was a bad cas. I have definetly noticed a difference since i have replaced my cas.