DTMAce's Z26 project - DD usage for the time being - 6-8-12

Tell us about your Beretta and Post an Image
User avatar
1988GTU
Registered User
Posts: 2744
Joined: Sat Mar 23, 2002 1:06 pm
Location: A town up north
Has thanked: 18 times
Been thanked: 11 times

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby 1988GTU » Thu Oct 04, 2012 7:30 pm

Is the exhaust glowing red up near the CAT?


_________
Image
-------------

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Thu Oct 04, 2012 8:06 pm

Well, I got my fuel pressure tester this evening. (had a new one picked up for me). Will check that in the morning, its pissing down rain right now. lol

And then we can finally put to bed the rumors and innuendo about my pump being weak all its life. LOL (sorry Jon)

:P


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Thu Oct 04, 2012 8:07 pm

1988GTU wrote:Is the exhaust glowing red up near the CAT?


Honestly, I don't know. Why?

I do know the upper intake seems to get hotter than normal, if I let it idle for 2 minutes or more (once it has been already run awhile)


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
99GaGT3X00
Registered User
Posts: 803
Joined: Tue Jan 11, 2005 1:56 pm
Location: North Brookfield,MA
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby 99GaGT3X00 » Thu Oct 04, 2012 9:23 pm

if it's glowing the cat's clogged.


Image
3400/3500 Hybrid
227/233@.050 .515.515 lift 112LSA
15.232@88.85mph on stock 3400

99 Grand Am GT------03 Subaru Outback H6

User avatar
Money pit Beretta
Registered User
Posts: 6353
Joined: Thu Jul 26, 2007 11:36 am
Location: Kansas
Has thanked: 2 times
Been thanked: 8 times

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby Money pit Beretta » Thu Oct 04, 2012 10:01 pm

That by far is true and something I did think about. ACE what about the coolant temp sensor in the head? Just for fun, could it be just a little bad and not keep the fan running and still make the engine run rich?


keep'em flying!

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Thu Oct 04, 2012 10:32 pm

Well, I plan to check the cat anyway, but no I haven't noticed that.

As for the fan? Hell that never runs unless the temp gets hot enough. So not sure where that comes into play.... Besides, the sensor/relay for the fan is on the Tstat, the one in the rear head feeds the gauge, if I recall correctly.


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Fri Oct 05, 2012 9:49 am

WELL.

I now can officially put the "fuel-pressure-low-causing-me-my-good-mileage" to bed.

Ran a test on it this morning.

Key on, pump primed: 40lbs on the nose.

Engine running, vacuum disconnected: 44lbs.

Engine revving, vacuum disconnected: I think it dropped to a low of maybe 42 or 40lbs, but it was like a quick flutter, not steady and it would go right back to 44. This happened when I would hit the throttle. I think it was more of a delay in response time to my revving it. But that was something I forgot to mention. lol

Vacuum connected, engine at idle: ~34lbs. (it bounced)

Vacuum connected revving engine: Zips right up to 44lbs.

Leak down test with engine off (obviously): Held 40lbs for the whole 15 minutes I gave it.

Seems to me the fuel pressure is fine. lol


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Mon Oct 08, 2012 11:33 pm

Going to pull and swap the computers tomorrow at some point.

Any other ideas out there? I guess I can try to find the time to do a cylinder pressure test, but not looking forward to that at all. Such a pain in the ass getting to the backside.

Down to it being one of 3 things I think:

Computer.
Wiring harness.
Valve problem on a cylinder, or a bad head gasket. Hell, it does have 241k on the original head gasket after all.
Could throw different plugs at it, but they all looked good, not that it means anything certain, though I can pull them and visually make sure they are sparking I suppose. May do that when/if I do the pressure test.

Let me know if you think of anything else. Be sure to read the previous posts, I have thrown a ton at it already.


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Tue Oct 09, 2012 8:41 pm

And it has gotten worse.

Now my gauges are screwed up, the second I turn on either parking lights or full headlights, it causes the RPM and speedo to go wacko. Either they scroll all over or just freeze in place. The odometer stops working right as well. And its running rougher than ever.

Starting to think that my problem is mostly electrical at this point, either a harness issue, or bad connection... However where to start? Why would turning on the lights cause the dash to go screwy? Anyone have an idea on what connector full of wires go to what at the computer, so I can narrow down the search? I want to make sure I don't have a bad wiring issue before I go swapping computers, as I don't want to take a chance on damaging the replacement if it IS a bad or messed up wiring issue.

2 facts I know for sure:

1: Wiring on this car is completely stock. I have never had to replace or redo any of the original wiring harness. It used to have an alarm system, but it was easy to remove without making a mess of the harness, they only tapped a couple of wires.

2: I have augmented the wiring, in that I added a battery feed for the rear amp, and have installed the LED lighting/resistors. But that is all mostly external in nature.

Apparently, chasing this problem has not revealed that I have found a problem to date, so apparently there is a wiring issue causing the engine to run like crap and giving me nightmares. lol

So I need to know which plug (at the computer) houses the timing/spark control wiring and which one houses the dash wiring. Can anyone tell/describe that?

Edit:

Just to clarify, I have NOT swapped the computers yet. This just happened on its own.


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
berettaboi
Registered User
Posts: 972
Joined: Sun Mar 23, 2008 10:58 pm
Location: canananada

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby berettaboi » Tue Oct 09, 2012 10:24 pm

test your battery real quick... they do funny things on their way out. if you have another (working good in another car) swap it for a few days, see if things persist.


4th one's a charm, 5th one is, beginnning to sound like this is an addiction...
95 black z26, '96 White z26 awaiting new life, and 2.5 mazda trucks
Image

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Tue Oct 09, 2012 10:44 pm

If the battery was going out, I think that would affect the cranking/starter in a noticeable way though..... I'm not feeling its a battery here. But yes, I can always try that. Now it could be something as simple as a bad ground someplace though. Hmmmm.

Will check into it.

Edit:

More to question, where are ALL the grounds found for the electrical system? IE, as in where they are located? I think one was on the firewall, but as to where? I'm sure this thing has multiple redundant connections on it in places. Thinking it may be a problem as simple as that. Going to have to slap myself if that's the case.


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
scd88ga
Registered User
Posts: 1828
Joined: Mon Jun 28, 2010 9:02 pm
Location: Wisconsin Rapids, Wisconsin
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby scd88ga » Tue Oct 09, 2012 11:25 pm

I'm going to go ahead and say the voltage regulator in your alternator is going out.


'94 Quad 4 H.O. 5 speed Z26, Red & Rare! 1 of 896 Quad Z26's and of those it's 1 of 167 red paint/gray interior!
Need A Quality Used Part? Contact me at Posihead Auto Parts!
https://www.facebook.com/pages/Posihead-Auto-Parts/336733779691724

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Tue Oct 09, 2012 11:58 pm

But the voltage on the dash shows that its fine. That, the oil pressure, temp and fuel are NOT affected. Only the RPM and the Speed are being wacked.

And the lights don't change intensity at all. If the battery or the alternator were causing the issues, I would see that with everything. But not everything is being affected. Primarily it appears to be ignition and dash, with the exterior lighting causing symptoms with the dash part only when turning them on. If I turn the heater fan on to max, that doesn't do anything, nor does using the windows or the rear defrost. Those things draw lots of power.

So I suspect that the battery and the alt are not the sources of this problem, but then I'm not ruling them out completely either. With everything I have been testing above, its hard to say. I appreciate the ideas however. :D


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image

User avatar
scd88ga
Registered User
Posts: 1828
Joined: Mon Jun 28, 2010 9:02 pm
Location: Wisconsin Rapids, Wisconsin
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby scd88ga » Wed Oct 10, 2012 4:54 am

Alright, so instead of skimming and skipping around this thread, I actually read all of it from when you problem began. I can only come up with 1 problem that could explain all your symptoms. That being a bad VSS (Vehicle Speed Sensor), this would explain your cluster issues (tach, speedo, odo) as well as the issues with the car running poorly (rich) because a bad VSS can throw the ECM into a "limp mode". The same thing that the ecm defaults too when the CTS (Coolant Temperature Sender) goes bad making the car run VERY rich thus causing an eventual misfire among other problems.

Aside from your actual ECM going bad (which I doubt with that design) I can think of no other single component that would cause these multiple problems.

Good luck! :good:


'94 Quad 4 H.O. 5 speed Z26, Red & Rare! 1 of 896 Quad Z26's and of those it's 1 of 167 red paint/gray interior!
Need A Quality Used Part? Contact me at Posihead Auto Parts!
https://www.facebook.com/pages/Posihead-Auto-Parts/336733779691724

User avatar
DTMAce
Registered User
Posts: 3510
Joined: Thu Sep 25, 2008 7:03 pm
Location: Michigan EUP
Contact:

Re: DTMAce's Z26 project - DD usage for the time being - 6-8

Postby DTMAce » Wed Oct 10, 2012 9:51 am

VSS? lol

So that would cause he gauges to act up only when I turn the lights on? Interesting. Where is that sensor?


94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan

Image
Image


Return to “Members Rides”

Who is online

Users browsing this forum: Yahoo [Bot] and 10 guests