Studder

[mwreed]

I am getting a studder at the top of 1st gear. It hits at about 5k. I'm only at 12psi when it creeps. I'm not sure what is going on. My mods are in my profile, but for ease, they are:

16G (I think small, came with the car)
255 lph fuel pump
afpr
3" O2 eliminater exhaust.
MBC
650 cc injectors
Eprom modified for injectors
Emanage

I have only adjusted the Eprom for the 650 cc's and have the Emanage zero'd out. I can't see anything in the log that looks odd aside from, maybe the injector pulse decreasing. I have fairly new wires. (about 3 months old) Checked the gap on the plugs about then too. Haven't verified them again, yet however. Here is a log from this morning in 1st.

Timing, O2, TPS, MAF, RPM, Knock, INJP

18.00º,0.90V,100.00%, 836.57Hz, 3437.50rpm, 2,10.50ms
16.00º,0.92V,100.00%, 1314.61Hz,4156.25rpm, 2,13.82ms
17.00º,0.92V,100.00%, 1603.95Hz,4687.50rpm, 1,14.85ms
18.00º,0.92V,100.00%, 1603.95Hz,5312.50rpm, 1,14.59ms
21.00º,0.90V,100.00%, 1603.95Hz,5875.00rpm, 1,14.34ms
23.00º,0.90V,100.00%, 1603.95Hz,6406.25rpm, 0,14.08ms
21.00º,0.90V,100.00%, 1603.95Hz,6625.00rpm, 0,13.31ms
20.00º,0.90V,100.00%, 1603.95Hz,7125.00rpm, 0,11.78ms


Any thoughts are appreciated... I want to get this figured out before I turn up the boost and tune.

Mike

 

[mwreed]

Checked the plugs this afternoon. They didn't seem bad and all of the wires were connected well. Is there anything else I should be logging to see what's going on? Should this post be moved to problem diagnosis? I may be having a connection issue with an injector too. I do get a cel on occasion for the injector circuit. The connectors aren't that great, but, the feel like they have good connections. I made clips to hold them on for now. (I have new connectors on order) I plan to update my Eprom this weekend to reflect the datalogging over 1600hz change and I noticed a couple values in the map that seem out of place. I think I am going to change them and see if that helps. While I am in there, I will be checking out the harness to see if my connections are bad. I soldered them, so they should be good. Anyone have any thoughts, I'll still appreciated the help.

Mike

 

[mwreed]

Car died yesterday, so, after some troubleshooting, I found the the transistor plug had worked itself loose. It seemed to only affect me at high rpms, yesterday, it finally worked its way off enough to totally kill it. Apparerently, I'm missing the wire clip on the plug and I don't have one on my parts car either. I guess I'll have to fabricate one. I did another pull today, and it looks pretty decent. I think now I can start tunning. Here's the log:

Timing O2 TPS RPM Knock INJD
20.00º 0.94V 100.00% 4218.75rpm 1 11.78ms
18.00º 0.94V 100.00% 4343.75rpm 0 12.03ms
18.00º 0.94V 100.00% 4750.00rpm 0 12.03ms
18.00º 0.92V 100.00% 4906.25rpm 0 11.78ms
19.00º 0.94V 100.00% 5187.50rpm 0 11.52ms
20.00º 0.92V 100.00% 5343.75rpm 1 11.26ms
21.00º 0.92V 100.00% 5343.75rpm 1 11.26ms
25.00º 0.92V 100.00% 5687.50rpm 0 11.26ms
26.00º 0.92V 100.00% 5750.00rpm 0 10.50ms
28.00º 0.92V 100.00% 5843.75rpm 0 11.01ms
28.00º 0.92V 100.00% 6125.00rpm 0 10.50ms
29.00º 0.92V 100.00% 6187.50rpm 0 10.24ms
28.00º 0.92V 100.00% 6187.50rpm 1 9.98ms
27.00º 0.92V 100.00% 6343.75rpm 1 9.98ms
27.00º 0.92V 100.00% 6406.25rpm 1 9.73ms
27.00º 0.92V 100.00% 6531.25rpm 0 9.73ms
28.00º 0.92V 95.29% 6625.00rpm 0 8.96ms