big problem and I need help

Well Alot of you have kept up with my posts on my car and if any of you remember in my last post I said it was running pretty shitty and I thought it was the untuned 550s. Well I threw in some 450s today and The plan was to just drive it with those untill I got a wideband and then throw the 550s back in. Well it ran almost exactly the same with 450s and the afc zero'd out as with 550s with a shitty tune. This leads to to think the problem is somewhere else in the fuel system, but all I changed was the filter. Basically it has bad throttle responce in netural and its super doggy under load. I could barly make it up a hill in first at wot. when I am crusing at 30 in thrid it runs perfect but if I give it any more gas the timing goes way retarded, at wot it went to -17 degrees(retarded). All I did for the record was a head job(grind valves and seats), got the head ported(mild), fmic, and a ported 16g. Thats all I changed. Any ideas?

:feedback:

So it still drives shitty even out of boost?

yeah, it seems to spit and spudder while boosting and is super doggy when not. The guys at tuners said to look for a crimped fuel line.

ok I figured out the ignition timing is really retarded and I cant figure why since you cant adjust base timing on a 2g. My thought is the knock sensor is decting a phantom knock so the ecu is retarding timing and you can watch the timing on my logget go from 22 advanced at idle to 14 retarded at wot and ideas?

ok I figured out the ignition timing is really retarded and I cant figure why since you cant adjust base timing on a 2g. My thought is the knock sensor is decting a phantom knock so the ecu is retarding timing and you can watch the timing on my logget go from 22 advanced at idle to 14 retarded at wot and ideas?


Why can you not adjust the base timing on the 2g? I don't know much about the 2g.

I would imagine that you could put it to TDC and adjust the timing that way?

Maybe your CAS is fubar

on a 95 the cas sits behind the intake cam gear and is in a fixed location therefore you cant adjust base timing with it. The sensor itself is brand new.

Make SURE the timing marks are lined up.

Make SURE the timing marks are lined up.
I am 100% sure that they are lined up perfect

Hm....weird. Maybe Kevin will come around and give some input, I'm fresh out of ideas.

Put on a fuel pressure gauge and check it under different loads. Idle, half-throttle, under power.

already tried that. At idle its 45psi but since my car wont go faster than 30 mph and I cant boost and cant tell what it goes to then

Well I'm thinking then it's somewhere else than fuel related. Better hope you got the angle on those valves perfect and your problem isn't occurring somewhere in the head after all that work. Other than that I don't know what to tell you.

sorry to ask again, but are you absolutely 100% sure the timing is lined up correctly???

checked and double checked. I guess it is possible that it maybe off but it would be a MAX of 1 tooth but I'm sure its dead on. I already did a leakage test and everything is sealed. As far as the fuel I've pretty much ruled it out. I know there is pressure getting to the motor and it is possible that there isnt enough volume but I didnt change anything with that so I dont see how it all the sudden changed

Have you tested the injectors to make sure they all work and make sure that they are all supplying fuel? Test each injector on its own and then make sure that they're all getting power also.

well it doesnt misfire at all, and I've had 2 sets of injectors in. volume could be an issure however. I noticed when I was measuring the coolant temp that the egts got progressivly hotter the further away from the feed line, #4 was ~600* #3 was ~750* #2 was ~800* and #1 was off the scale

Have you upgraded the fuel pump yet? I know you should still be able to run decently on the original one but if you haven't upgraded yet, you might as well rule that out and it'll be an upgrade, in other words kill 2 birds with 1 stone.

well I already know for sure that the problem is the ignition timing is retarded, my teacher wants to figure out how to make the car go into base timing mode and then see if the knock sensor might be causing the problem.

Hhhmmmmm...... well I'm trying to figure out why timing would be pulled SO much. I'm checking tuners right now, I'll update this if I find anything.

EDIT: Try resetting the ECU, maybe some things got screwed up with all the changes you made.

well the car was sitting a month with no battery so I think the ecu got as reset as it will ever get(hopefully I didnt sound like an ass when I said that) but I know what you mean.

Yeah but it never hurts to try it again being as it takes like 2 minutes. And it would be one more thing to rule out.

OK I found the problem today. I was testing the cam and crank sensors and the labscope said they werent in sync and during lunch I was thinking about it and I got back and took the timing belt off and sure enough, the wheel that the crank sensor reads was put on backwards causing it to be off 20* so no I just need to put it back together and it should be good

See, I told you to make sure timing was 100% :p

well I knew the ignition timing was off and the cam timing was still 100% dead on it was just a plate that was backwards. To be honest I didnt put it on, my buddy did and that is how it happened because I took it off and he got mixed up. No harm no foul

sorry to ask again, but are you absolutely 100% sure the timing is lined up correctly???


:grinno: I thought so, those symptons were 100% bad timing.

to reiderate, timing was correct, cam timing that is. The only thing that was wrong was the crank sensor plat was flipped around causing the crank sensor to be 20* off when firing the spark, nothing to do with actual timing

to reiderate, timing was correct, cam timing that is. The only thing that was wrong was the crank sensor plat was flipped around causing the crank sensor to be 20* off when firing the spark, nothing to do with actual timing


so timing was 20 degrees off...timing involves more than just lining up the marks right

I guess that depends on if you are talking about physical timing or ignition timing. You said timing is off, didnt specify, so I assumed you ment the physical aspect

doesn't matter now, your car will be boosting fine soon enough ;)

exactly, I cant wait

I didnt put it on, my buddy did and that is how it happened

See now that's why. If you would have said that right away I could have told you that he put the plate on backwards. And now expect other things to go wrong now too because you let him work on it. :nono: :grinyes: