Hard to start and rough idle data log

[panamarojo]

Well I fixed the data logger cable that I bought off of ebay for 30 bucks. The guy had it all wrong. So thanks for all the help from everyone. The problem I found so far is I am getting weak fuel pressure. Probably my fuel pump is going bad but it powers on. Just wondering if my data log results will show a problem.

TPS 17.5%
TimA 5 degrees
O2-f 2.50V
Cool 3.6 degrees C
AirT 5.9 degrees C
Baro .84bar
Egrt -28.2 degrees C is this my problem??
Batt 12.1
ISC 46.8%
all the FTRL's 100% with key on, didnt notice a change while cranking
F160 -s--1
MAFS with key on 0, MAFS while cranking 37

Anything wierd here to you pro's?

 

[EclipticalGS]

your 02 voltage is 2.5? at idle. Wrong. Thats 36.75 afr using narrowband.

I think your front 02's bad

 

[panamarojo]

Actually its not at idle, its very hard to get it to idle. So those readings are just with the key on the on position.

And its about 40 degrees F outside. so bout 4.4 degrees C right?

Well I read that the EGRT will read this. And the only other thing I was really worried about was my ISC%, I was told it should be between 90 and 120. This is while just the key is on the on position. But I don't think that is whats causing my problem but its probably causing me to have idle problems?

 

[panamarojo]

Well I went ahead and ordered a walbro 190, so ill let you all know how it goes, probably by Saturday.

 

[steve]

Just wondering if my data log results will show a problem.

TPS 17.5%
TimA 5 degrees
O2-f 2.50V
Cool 3.6 degrees C
AirT 5.9 degrees C
Baro .84bar
Egrt -28.2 degrees C is this my problem??
Batt 12.1
ISC 46.8%
all the FTRL's 100% with key on, didnt notice a change while cranking
F160 -s--1
MAFS with key on 0, MAFS while cranking 37

Anything wierd here to you pro's?

your 02 voltage is 2.5? at idle. Wrong. Thats 36.75 afr using narrowband.

I think your front 02's bad

I assume this is from MMCd. The actual 1G O2 sensor is O2-R not O2-F like you would expect. So the value is meaningless.

Only California cars and I think 94's have a EGR Temp sensor. You don't need to log this.

If these numbers are for while the car is running your battery voltage is too low, it should be between 13.8 and 14.4 when the car is running.

Change the units so we see ISC steps not %.
If the car was idling then your TPS is misadjusted. It should read 10% when the throttle is closed.

The Timing number makes me think these were without the car running. Keep in mind that the ECU doesn't know the actual timing. It know how much advance or retard it's using and assumes that you have correctly adjusted the CAS with a timing light to set the timing to 5* BTDC. If if not then you have to add or subtract the actual difference from what the logger shows.

 

[panamarojo]

I assume this is from MMCd. The actual 1G O2 sensor is O2-R not O2-F like you would expect. So the value is meaningless.

Only California cars and I think 94's have a EGR Temp sensor. You don't need to log this.

If these numbers are for while the car is running your battery voltage is too low, it should be between 13.8 and 14.4 when the car is running.

Change the units so we see ISC steps not %.
If the car was idling then your TPS is misadjusted. It should read 10% when the throttle is closed..

How do I change the ISC units to steps?

Does the TPS have a reading when the key is on the on position? Engine not running. And how much volts should I have with the key on with out the engine running?

Yea this is just with the key on the on position. I can't get it to idle yet, but hopefully Saturday I can log how it is running. Should have a 190 in there by then.

 

[steve]

Does the TPS have a reading when the key is on the on position? Engine not running.

And how much volts should I have with the key on with out the engine running?

Yes, the TPS is powered when the ECU is running. You need to first make sure the throttle cable isn't holding the throttle open and then loosen the two bolts and rotate the TPS until it reads 10% in the logger.

That battery voltage isn't too far from what you would expect a battery to read at the terminals. 12.6v is what you expect from a fully charged battery at the terminals. The battery voltage at the ECU is going to be slightly lower.

When you first start MMCd the first screen where you would select an existing log or click the new button says MMCD on the top, click on it and choose options slide down to preferences and then set Units to English and Vehicle to DSM if there is the option.

 

[sharobious]

Im having the same problem with my 1g...it doesnt crank right up...takes like 4 seconds to crank up, and the idle is so rough...im about to look for an logger locally or i my just get on ebay and pick up one so i can see whats going on

 

[Dizorganizer]

after the car gets warm does it run fine?

 

[panamarojo]

Well the walbro 190 did the trick. DSM is back up and running. Thanks everyone. The fuel pump must have just been getting weaker and weaker.