Sputtering and hesitation problems

[fooked]

Hey guys, this is somewhat similar to the other thread on here, but I figured I'd give you some more info.

I've had the car for about a year now, and I've always noticed that I would get some hesitation occaisionally. It builds boost and the RPM's go up, but it feels like the car is being held back. It doesn't happen too often though.

I upgraded to a 14b turbo, ported exhaust mani, ported O2 sensor housing, and Walbro 255 fuel pump three weeks ago. I haven't driven it too much since then because of other issues.

I took the car for a spin the other night and it started bogging and sputtering alot especially when starting from a stop. Then it started doing it when I was cruising on the freeway. I thought it might be a bad tank of gas so I filled up. Same problem. Ran a bottle of fuel injector cleaner through it. Didn't help. We just put in new NGK plugs when I did the turbo. I put a new set of plug wires on last night as well, and it's still doing it.

Might it be a fuel pump or fuel injector problem? I'm going to get upgraded injectors in the next couple months, but I don't have the cash for them at the moment. Is there any way to figure out what is going on. The only C/E error code I get is the usual p1104 from the test pipe.

Any help would be great.

Thanks,

Steve

[Iwishiwascool]

boost leak

the end

[fooked]

Really? You think so. I don't know alot about boost leaks, but this happens when I'm not even boosting.

[Iwishiwascool]

yup

lets say the mas counts X amt of air and injects Z amt of fuel to establish its lil Golden ratio. Some where are the air passes the Mass it picks up/loses some air. X +/- .124 amt air mixes with Z fuel, the ratio is off, you get an im too lean/too rich studder.

It have to be a pretty big one.

[fooked]

Well, I checked for leaks and can't seem to find anywhere where there could possibly be one.

I've also swapped the stock fuel pump in to make sure it wasn't that. So it's not plugs, plug wires, fuel pump, or boost leak (that I know of). I hadn't been pulling up any abnormal codes from the logger. I always get a P1104 error code which I believe is from the test pipe. Does anyone know for sure what that code is? My logger doesn't have a definition for it, and I can't seem to find it online.

At some points the car seems to run VERY badly like it's just going to die. Today is different though. After playing around like night with vacum hoses and taking the MAS off of the intake and checking it, I haven't had any problems.

I did pull up a new error code today. It's P0105. The code translates to "Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction ".

I'm not sure what that means. I've done a little searching, but haven't really come up with anything.

Anyone have any ideas? I want to get the car running right before the shootout.

Thanks,
Steve

[biglipps66]

P1104 MAF Ground Malfunction :thumb
This would deffinately cause problems for you Ide say. Make sure all of your wiring is ok and nothing is loose or shorting somewhere


0105 make sure the little map sensor on the top is hooked up to the intake manifold correctly. I dont think that would cause ANY problems at all for you though. Me and Ken dont even use them on our cars.

Clear your errors and make sure you dont get another 1104 tho :D

[ucsigep]

P1104 - Turbocharger Wastegate Solenoid Malfunction
If you aren't using the stock BCS, that's what that is. I left mine plugged in, just no vacuum lines hooked up to keep from throwing that code.

P0105, may be the MAP sensor on the top of the intake mani, but I think that one throws a different code. Not sure.

[biglipps66]

P1104 - Turbocharger Wastegate Solenoid Malfunction
If you aren't using the stock BCS, that's what that is. I left mine plugged in, just no vacuum lines hooked up to keep from throwing that code.

P0105, may be the MAP sensor on the top of the intake mani, but I think that one throws a different code. Not sure.


Ya I seen that as well Jeff.. although that site said 1104 was for a Jeep car :confused

[ucsigep]

Ya I seen that as well Jeff.. although that site said 1104 was for a Jeep car

Well, it was probably referring to Jeeps as a site. Here's the one I use: http://www.troublecodes.net/mitsu/

[biglipps66]

Ya I seen that as well Jeff.. although that site said 1104 was for a Jeep car

Well, it was probably referring to Jeeps as a site. Here's the one I use: http://www.troublecodes.net/mitsu/


Gotcha.. I was on http://www.scantool.net/files/pcodes.txt

[ucsigep]

yeah, there's an ass-ton of sites with codes, but it's rare to find a mitsu list. 99% of the time, it doesn't matter which you look at, the code is going to be the same.

[DSM614]

its the map sensor, my bro's 95 was doing the exact same thing...im pretty sure im right on this one...

[ucsigep]

Well, yes, the code is MAP sensor, I was just saying it may be the one on top of the intake mani, but I know for a fact (after double-checking) that the sensor on top usually gives a different code, P1400 - Manifold Differential Pressure sensor.

[fooked]

Hmmm...Could any of these problems cause the issues my car is having, or are these unrelated?

By the way, thanks for the error code sites. I knew that if the first digit is a 1 it's manufacturer specific. That's why I couldn't find the p1104 code anywhere.

[Iwishiwascool]

map sensor isnt even needed.

[biglipps66]

map sensor isnt even needed.

agree with Ken.. were both not running with them.

I dont think these 2 should give you any troubles. I take it youve checked plugs and wires and such.

check comp. just to make sure your ok there as well.

[fooked]

Yeah, plugs, wires, fuel pump, and fuel filter were all done about 3 weeks ago when I did the turbo upgrade.

Is there any way to test the ignition coil? I've had issues similar to this on other cars in the past, and it has turned out to be related to the ignition coil.

[biglipps66]

turbo upgrade?

List ALL of your mods...
from your turbo to your injectors, gauges, everything...

[ucsigep]

Lipps, read his first post, "I upgraded to a 14b turbo,...."

Anyways, still list your mods? Fuel control of any kind? AFC or the like? Still have stock injectors? 255 pump, is it rewired? Have you pulled the plugs, how do they look? http://www.mkiv.com/techarticles/read_plug/plugdiag.jpg

[fooked]

damn man....you are quick. ;)

Thermal 3" cat back, 2.5" downpipe, 2.5" test pipe, ported 7cm exhaust manifold, ported o2 sensor housing, 14b turbo, Joe p manual boost controller, Walbro 255 fuel pump, Apexi SAFCII, Injen intake and air filter, Autometer ultralight boost gauge, Autometer ultralight air fuel ration gauge, NGK 7es spark plug, Magnecor spark plug wires, stock SMIC, Dave Brode UICP, and HKS SSQ BOV. I think that's it. I can't remember anything else.

I assume you don't need the suspension mods. :thumb

Thanks for the help,

Steve

[biglipps66]

NGK 7es spark plug


Why arent you running 6es plugs young man. 7es's are for high power outputter people.

Are you sure you have that AFC tuned correctly? How much boost are you running? I didnt notice an EGT gauge in there did you forget that?

If you dont have an EGT gauge you should try and get one, and stay away from tuning with the AFC for a while. At least get a pocket logger if you dont have one, to watch timing.

[fooked]

Hmmm... I thought the 7es's would be okay to run in there. That's what was in it when I replaced them.

I haven't pulled the plugs out yet. I'll do that tonight. They are only 3 weeks old, but I might as well check them just to be sure.

I have an EGT gauge. It's not installed yet. I just got it last Friday. I also have a datalogger, but I'm not real sure how to use it too well yet. I have it hooked up and monitoring basic functions and pulling error codes.

I'm running about 17-18 PSI at the moment, but my boost controller is goofy and is kind of doing it's own thing. We tried to crank down the boost the other night and found that the spring was missing. Evidentally its been like that since before I bought the car, because I haven't touched the boost controller since I bought the car.

The AFC is just monitoring as well. I don't have any correction setup or anything. I'm waiting for my fuel injectors to come in for that. :thumb

Thanks again guys,

Steve

[ucsigep]

TOOOOOOOONING!!!!!! That may be all you need to fix it. Injectors won't make a difference on that turbo, and with a bigger fuel pump, you're probably way rich. Plugs, pull 'em and check 'em, I will bet there is a nice carbon buildup on them. Learn your logger, install the EGT, and put 6's in. Then tune the afc using the logger and egt.

[biglipps66]

TOOOOOOOONING!!!!!! That may be all you need to fix it. Injectors won't make a difference on that turbo, and with a bigger fuel pump, you're probably way rich. Plugs, pull 'em and check 'em, I will bet there is a nice carbon buildup on them. Learn your logger, install the EGT, and put 6's in. Then tune the afc using the logger and egt.

EXACTLY what I was going to say.

[Iwishiwascool]

FPR would help too. You are drowning that thing. Im surprised you dont see a big puff evertime you hit the gas

[M 4 L k i 3 R]

Yeah, just ask Jeff about a car that runs a little rich. Right Jeff?? :thumb

[ucsigep]

roger....

[EvolvedDSM]

I'd switch back to BPR6ES plugs until you go big on boost (20+lbs).

penny
penny

[biglipps66]

3 votes on 6es's ;)