Car Won't Idle

[ohlegend]

Ok, so before I fixed my boost/vac leak, I was able to idle the car for 30 seconds. If I unplugged the MAF, It would idle between 800-1000 and it would not cut out.
I found a huge leak at my intake manifold, replaced the gasket and mounted everything back on the car. (All vac lines and connectors are connected). Now, I turn on the car and it will run for 20 seconds or less and die. I did another vacuum test and it did not leak. So I have come to the conclusion the it could be one of the following things:
ECU
Not enough spark
Low Fuel pressure (bad FPR)

If I give it some gas it lags for a bit, backfires and then revs up.

Any ideas? Am I on the right track?

I have new battery terminals and another ECU on the way. - FYI

 

[gieri002]

It sounds like the opposite to me. Backfiring when reving is because of excess fuel. Backfiring on decel would be a lean condition.

Are you throwing any CELs?

It still sounds like you have a big boost leak to me.

 

[ohlegend]

No CELs. Boost and vac tests passed. There is nothing leaking anywhere from the intake manifold back. I also got the BOV to chirp. - I dont know if that helps or not. I will be checking over everything again this weekend.

 

[shakeandbake]

Have you checked to see if your maf is still good? Car runs ok with no maf after fix?

 

[untouchablecc]

It still sounds like a boost leak even though you've performed the test. I wonder how your doing it. Do you have the vacuum line from the fuel pressure regulator hooked up to the intake manifold or fp solnoid?

 

[gofast63]

Have you inspected your original ECU?

 

[TallestHERETIC]

From what I can tell so far, the cam or crank sensor is having a hard time communicating with the ECU which would explain the random, abrupt shutdowns. Take a quick look at them to see if there's any damage.

My car idles smoothly at a constant 500 RPM. I think that's where it is supposed to stay at.

 

[gofast63]

From what I can tell so far, the cam or crank sensor is having a hard time communicating with the ECU which would explain the random, abrupt shutdowns. Take a quick look at them to see if there's any damage.

My car idles smoothly at a constant 500 RPM. I think that's where it is supposed to stay at.

I believe the idle speed is set by the ecu at 750 rpms. A 100+/- is considered normal.

 

[1G Eclipse94928]

I believe the idle speed is set by the ecu at 750 rpms. A 100+/- is considered normal.

Thats correct on my 90 eclipse gsx

 

[ohlegend]

CAS and Cam shaft sensors are new. I just replaced the MAF and it worked better than before.
My ecu should be here mid week.

 

[gieri002]

How are you doing your "vacuum" tests?

 

[ohlegend]

I am pressurizing the intake elbow to see if there are any leaks at the throttle/manifold.There are not any. My friend also brought up that there was 1/8 of a tank of gas that had been sitting in the car for 2 years. I added another 1/8 tank of premium and a little bit of octane booster. Could the problem be that my octane level is too low?

 

[gofast63]

I am pressurizing the intake elbow to see if there are any leaks at the throttle/manifold.There are not any. My friend also brought up that there was 1/8 of a tank of gas that had been sitting in the car for 2 years. I added another 1/8 tank of premium and a little bit of octane booster. Could the problem be that my octane level is too low?

In that case, you need to add a can of sea foam and then put at least four gallons of fresh premium gas in it. Don't add any more octane booster.

Also its better if you do a boost leak test from the turbo. So you can see if you have any leaks around your intercooler piping. You can make one for like 8 bucks from lowes or home depot.

 

[ohlegend]

I was able to pull data from the car while it was running:

Live Data
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)0.0
Engine Coolant Temperature(¡£C)16
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 0
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)5.0
Intake Air Temperature(¡£C)4
Air Flow Rate from Mass Air Flow(g/s)6.10
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.060
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)30.2
Engine Coolant Temperature(¡£C)16
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 902
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)19.0
Intake Air Temperature(¡£C)4
Air Flow Rate from Mass Air Flow(g/s)4.73
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)23.5
Engine Coolant Temperature(¡£C)17
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 839
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)19.0
Intake Air Temperature(¡£C)4
Air Flow Rate from Mass Air Flow(g/s)5.05
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)23.9
Engine Coolant Temperature(¡£C)18
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 882
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)18.0
Intake Air Temperature(¡£C)3
Air Flow Rate from Mass Air Flow(g/s)4.96
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)23.5
Engine Coolant Temperature(¡£C)19
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 851
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)19.0
Intake Air Temperature(¡£C)3
Air Flow Rate from Mass Air Flow(g/s)5.07
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)23.9
Engine Coolant Temperature(¡£C)19
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 898
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)19.0
Intake Air Temperature(¡£C)3
Air Flow Rate from Mass Air Flow(g/s)5.06
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)23.5
Engine Coolant Temperature(¡£C)19
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 847
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)19.0
Intake Air Temperature(¡£C)3
Air Flow Rate from Mass Air Flow(g/s)4.89
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.080
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)27.5
Engine Coolant Temperature(¡£C)20
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Engine RPM(rpm) 691
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)21.0
Intake Air Temperature(¡£C)3
Air Flow Rate from Mass Air Flow(g/s)4.46
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)1.275
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.060
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
----------------------


Modules Present
ID: Protocol
$00: ISO 9141-2

 

[ohlegend]

Any ideas on this data?

 

[gofast63]

Any ideas on this data?

Thats not really telling us anything.

 

[952g63t]

Had a similar issue and it turned out to be a combination of bad fuel and a loose MAF connection.

 

[ohlegend]

I also put a new Walbro pump in a few months back when I bought this car.
I have not had it out to drive yet.
I can hear it when I start the car, but I dont hear it after that.
Maybe my car in running off the initial pressure, then when that pressure dies down, it stalls out?

 

[952g63t]

What fuel pump? 190? If its rated more than that you need a FPR. Really sounds like fuel delivery issue.

 

[ohlegend]

I believe it is the 255LPH.

So should I get an Adjustable FPR?
if so, what is a good one to get?

 

[952g63t]

Yes. Depends on how you want to set it up. You would probably be better off with a kit from a vendor on tuners.

DSM Fuel Pressure - DSMtuners.com

 

[ohlegend]

I think I am going to try to put the stock fuel pump back in tonight. I'm not ready to upgrade the fuel system yet.

 

[ohlegend]

I found that part of my crankshaft sensor broke off. I am in the process of replacing that and re-timing everything.

 

[T-Flexx]

The 255 def requires a aftermarket FPR. Aeromotive is a really popular/reliable brand. Also don't know a whole lot about the data that you logged but is it showing 19* advanced timing?? wouldn't that be a lot? someone else would have to chime in on that.

 

[ohlegend]

Ok so we got the car properly timed and we are still having issues. We noticed that it felt like there was back pressure, it smelled rich, and black stuff was coming out of the exhaust. The car chokes its self out.
Do you guys think that maybe the cat. converter is plugged up or the muffler?