Problem in higher RPMs

[boosted92laser]

I am having a problem with my car in the mid to higher RPMs. Once it hits about 3k, it starts to buck, kind a like fuel fuel cut, but not quite as harsh. I rewired the fuel pump with 8 guage wire and triggered the relay with the original fuel pump power wire.

I did a boost leak test and it holds 20 psi no problem.

It has brand new NGK plugs, NGK wires, and fuel filter.

I thought it might be the MAF. But I don't want to spend $300 if it won't even help out.

Any input would be great.

 

[The_EE]

Did the vac line come off the fuel pressure regulator? I know my car did that when the vac line came off once. How it came off is beyond me.

 

[TurboAWDKID]

how much boost? any tuning devices? logger? FPR? sounds like your running rich. try leaning things out a bit if you can.

 

[boosted92laser]

Did the vac line come off the fuel pressure regulator? I know my car did that when the vac line came off once. How it came off is beyond me.

The vacum line is still on the regulator. That is one of the first things that I checked.
It has been like this for over a month. I have been checking a few things here and there, but no luck.

how much boost? any tuning devices? logger? FPR? sounds like your running rich. try leaning things out a bit if you can.

I am only running like 10 lbs of boost. I don't have any tuning devices yet. I have to wait for my bonus check from work before I can spend that kind of money. It has the stock fpr. I am pretty sure that it is running rich. I think part of the reason is because of the ISC and the oring around the BISS. I have another ISC sitting here ready to be put on tomorrow. I am taking the BISS out to get another oring also.

 

[94Jettameowpsst]

Check all your plugs and wires. Mine was doing the same thing till i found out you could take them out without a ratchet :x

 

[boosted92laser]

Check all your plugs and wires. Mine was doing the same thing till i found out you could take them out without a ratchet :x

The plugs and wires have about 75 miles on them. And yes, the plugs are still tight, I just double checked.

 

[94Jettameowpsst]

Check if all the wires are tight in the harness for your transistor pack.

If its not that, its most likely your maf then if those are your only mods in your profile. Running rich and bucking are symptoms of a dying maf but im wondering why you wouldnt get a cel.

Just for fun....do a compression test, my friends motor pooped out and had the same symptoms you mentioned....dont wanna scare ya, just makin sure tho

Good luck

 

[boosted92laser]

Check if all the wires are tight in the harness for your transistor pack.

If its not that, its most likely your maf then if those are your only mods in your profile. Running rich and bucking are symptoms of a dying maf but im wondering why you wouldnt get a cel.

Just for fun....do a compression test, my friends motor pooped out and had the same symptoms you mentioned....dont wanna scare ya, just makin sure tho

Good luck

All the wires are tight at the transistor pack.

I let a friend borrow my compression tester. When I get it back, I will do a compression check and post the numbers. I sure as hell hope that it isn't that. The motor only has about 800 miles on it.

 

[94Jettameowpsst]

It could be that its not completely broken in for some reason. Did you re-tighten your head studs? My 1g at one point in time had similar symptoms and i rechecked the head studs and they came loose a little bit.
Most likely not the problem, but im just giving you options....it REALLY sucks when stuff doesnt work right and you have no idea what it is.

 

[T9S1i]

did you gap the plugs properly? It could be spark blow out. This happened to me and i gapped em back to 0.028 ad my problem went away. The car felt like it bucked and missfired and felt real wierd.

Just one other thing to check.

 

[Maglin]

I'll second a compression check. Check your plugs if you know how to read them. They shouldn't be white and chalking. Do you have a logger? If so you should be able to look at your Hz and see if it jumps up and down a lot. In a last ditch effort you can just unplug the MAF and see if it does the same thing. It's running in alpha-N mode using RPM and TPS for fueling calc's and lowers the rev limiter to either 4500 or 3500 but I can't remember which off the top of my head. It would be a one pull kind of thing and something you wouldn't want to run.

Hell maybe it is just a head gasket. They are cheaper than a MAS to replace. If it is your HG you might want to track down why it blew in the first place since this is on a fresh motor.

 

[TurboAWDKID]

when i started tuning my car it seemed near impossible... then i found that my 1g mas was bad. it started throwing error codes on my logger, but it DIDN'T throw a CEL, so like what was said before, you could have a bad mas and just not know it, nor would you know it unless you hook a logger up or switch the mas an see if that helps.

 

[boosted92laser]

I am pretty sure that it is the mas. I unplugged it, the idle smoothed out and dropped like it is supposed to and ran better. I didn't drive it but that was enough of a result for me. I can order a new one from work for like $200. But I don't have that kind of money for one right now.

If anybody has a working one that they will sell me, let me know.