WTF??? help me diagnose this one...

T

thesupragod

Supramania Contributor
Apr 10, 2005
183
0
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Mount Vernon, Ohio
My supra started doing something really odd on thursday, ill give everyone a run down;
1jz
single turbo
fmic / hardpipes
5 speed
mines ecu / afc neo
440 cc injectors
walboro pump
aeromotive fpr
BC 272's

everything else is irrelevant.


So heres the situation, im driving along car is running well... all of the sudden, tach starts jumping, check engine light comes on and it starts running really bad. Super rich, more than 10:1, backfires if given too much throttle, no power, and wont rev past like 2200 rpm.

There are a ton of posts that "My 1j wont rev past xxx" that is not the case here, normally the car runs like a champ, but then this shit starts, i cant figure it out...

So i change the spark plugs (which were drenched in gas) and she fires up, runs like nothing was wrong in the first place.

What do you guys think?

Thanks for any advice!

--pics on page 3
 
Last edited:
92TealSupra

92TealSupra

Supramania's Parts Man
Sep 2, 2008
1,584
0
36
Great Lakes State
Did your fuel pressure reg have an issue? All vacuum lines attached correctly?

Check engine light came on you said, did you check the code it gave? Is everything like grounds secure?
 
JonoTurbo

JonoTurbo

Going for broke
Mar 30, 2005
670
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CT
What code did it throw?

Because of the seemingly random nature of the problem I'm going to go with wiring or ECU.
 
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thesupragod

Supramania Contributor
Apr 10, 2005
183
0
16
42
Mount Vernon, Ohio
sorry, forgot to mention that bit about the cel... for some reason i cannot check my codes, its like the e01 prong in the diag box doesnt exist for some reason... cant quite figure that one out...
 
86_sports_1jz

86_sports_1jz

slow 700hp build...
Aug 27, 2006
1,217
0
0
OK
also check your walbro pump... mine did the samething you described and i never figured it out... i'm starting to think i might need an new walbro... if you slowly accel you can get past 2200 rpms but then after about 3k rpms it runs deadly lean
 
92TealSupra

92TealSupra

Supramania's Parts Man
Sep 2, 2008
1,584
0
36
Great Lakes State
thesupragod;1498749 said:
sorry, forgot to mention that bit about the cel... for some reason i cannot check my codes, its like the e01 prong in the diag box doesnt exist for some reason... cant quite figure that one out...
Click to expand...

e01 is a ground, and that actually goes to the ECU pinout too..

Check for grounds and make sure everything is secure..
 
JonoTurbo

JonoTurbo

Going for broke
Mar 30, 2005
670
0
0
40
CT
Depending on the damage sometimes you can fix ECU's, sometimes you can't. I would recommend checking it before you run it anymore, because if the caps are leaking using it may only cause more damage. Get some pics up and I can tell you if it looks fixable.
 
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thesupragod

Supramania Contributor
Apr 10, 2005
183
0
16
42
Mount Vernon, Ohio
checked my coil packs, They were all cracked, not to badly but im going to try the fingernail polish fix and will post back with results.

Did not get time to check the ECU, Intercooler pipes are in perfect order.

Thanks guys!
 
T

thesupragod

Supramania Contributor
Apr 10, 2005
183
0
16
42
Mount Vernon, Ohio
Well, it looks good, for the exception of one burnt capacitor on the main board. A closer look reveals that they blue diode beside it looks like it was taken out as well...

Let me know what you guys think.

I put a new o2 sensor in today with ngk plugs gapped at .025. I installed my freshly repaired coil packs (fingernail polish looks like it worked well). She ran ok when i was on the throttle, she wont idle at all though.

after running her at ~1500 rpm for a minute or so, the tachometer got all jumpy/jerky even though i didnt move my foot, also it went rich as hell simultaneously.

So here are the pics of the ecu as promised!

http://lh6.ggpht.com/_ISJGUsRyTxE/S2XE8DrUA8I/AAAAAAAAB8Y/qU9n-HWH_oI/s800/CIMG2299.JPG
 
W

whitemike

Banned
Aug 30, 2009
1,164
0
0
Winter Park, Florida, United States
thesupragod;1503544 said:
Well, it looks good, for the exception of one burnt capacitor on the main board. A closer look reveals that they blue diode beside it looks like it was taken out as well...

Let me know what you guys think.

I put a new o2 sensor in today with ngk plugs gapped at .025. I installed my freshly repaired coil packs (fingernail polish looks like it worked well). She ran ok when i was on the throttle, she wont idle at all though.

after running her at ~1500 rpm for a minute or so, the tachometer got all jumpy/jerky even though i didnt move my foot, also it went rich as hell simultaneously.

So here are the pics of the ecu as promised!

<br />

<img src="http://lh3.ggpht.com/_ISJGUsRyTxE/S2XE6SJE6dI/AAAAAAAAB8I/xcxAA7C_4OQ/s144/CIMG2289.JPG" border="0" alt="" class="tcattdimgresizer" onload="NcodeImageResizer.createOn(this);"

<img src="http://lh3.ggpht.com/_ISJGUsRyTxE/S2XE62528WI/AAAAAAAAB8M/JxysqdUEVVs/s144/CIMG2290.JPG" border="0" alt="" class="tcattdimgresizer" onload="NcodeImageResizer.createOn(this);" /><br />
<br />

<img src="http://lh3.ggpht.com/_ISJGUsRyTxE/S2XE7K4hJOI/AAAAAAAAB8Q/C6J4QseKBN8/s144/CIMG2293.JPG" border="0" alt="" class="tcattdimgresizer" onload="NcodeImageResizer.createOn(this);" /><br />
<br />

<img src="http://lh5.ggpht.com/_ISJGUsRyTxE/S2XE7lSV0uI/AAAAAAAAB8U/3XWEXuwfk7E/s144/CIMG2295.JPG" border="0" alt="" class="tcattdimgresizer" onload="NcodeImageResizer.createOn(this);" /><br />
<br />

<img src="http://lh6.ggpht.com/_ISJGUsRyTxE/S2XE8DrUA8I/AAAAAAAAB8Y/qU9n-HWH_oI/s144/CIMG2299.JPG" border="0" alt="" class="tcattdimgresizer" onload="NcodeImageResizer.createOn(this);" /><br />
<br />
Click to expand...

Did you not realize that your pics weren't showing up after you posted them? Let me fix that for you..

Edit: Thumbnail fail.


CIMG2289.JPG


CIMG2290.JPG


CIMG2293.JPG


CIMG2295.JPG


CIMG2299.JPG
 
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