Notices
C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Thoughts on Miniram for 85 with ZZ4

 
Old 12-24-2018, 04:25 PM
  #41  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

double post

Last edited by 85WHITEZ51; 12-26-2018 at 12:49 AM.
85WHITEZ51 is offline  
Old 12-24-2018, 04:26 PM
  #42  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

pic of (lack of) progress
85WHITEZ51 is offline  
Old 12-24-2018, 06:01 PM
  #43  
Capt Mike
CF Senior Member
 
Capt Mike's Avatar
 
Member Since: Jan 2015
Location: Oregon
Posts: 199
Thanked 12 Times in 11 Posts
Default

85WHITEZ51

Feel kind of silly at this point as I've probably spent more on this car in the last 3 months then what it's worth but I've owned the car for 20 years so it was hard to consider selling it for another on.

Na, don't be, we take love and tender care of our Vettes !!

You mention something important about the oil pressure. Our cars wont start until they see a set PSI (or higher) of oil pressure. It's possible that may be part of your issue as well

Not So, as there is a circuit that engages the Fuel pump relay, a very short signal, see pin A1 to fuel pump relay. If your engine will notstart until the oil pressure is up, then there is an issue is the fuel pump relay circuit. Check for fried points in this relay or lack of signal from the ECM... Pesky but vital

And a photo of my little gal Lois, with the factory hardtop

Michael.....



You can also aptly battery voltage to pin G on the OBD service connector. See attached diagram.

Another little PEST at times is the hidden away forgotten Fuel pressure accumulator It is between the fuel filter and engine. Can be a pain if its partially plugged, the Ethanol fuel doesn't help, diagram also attached.



Capt Mike is offline  
Old 12-24-2018, 09:54 PM
  #44  
383vett
CF Senior Member
 
383vett's Avatar
 
Member Since: Apr 2003
Location: moraga ca
Posts: 15,733
Thanked 658 Times in 487 Posts
Default

Originally Posted by Capt Mike View Post
85WHITEZ51



You mention something important about the oil pressure. Our cars wont start until they see a set PSI (or higher) of oil pressure. It's possible that may be part of your issue as well

Not So, as there is a circuit that engages the Fuel pump relay, a very short signal, see pin A1 to fuel pump relay. If your engine will notstart until the oil pressure is up, then there is an issue is the fuel pump relay circuit. Check for fried points in this relay or lack of signal from the ECM... Pesky but vital

You are 100% right
383vett is offline  
Old 12-25-2018, 12:22 AM
  #45  
Capt Mike
CF Senior Member
 
Capt Mike's Avatar
 
Member Since: Jan 2015
Location: Oregon
Posts: 199
Thanked 12 Times in 11 Posts
Default

I learned the hard way, only one though....

Happy Holidays
Capt Mike is offline  
Old 12-26-2018, 12:54 AM
  #46  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

Fuel pressure accumulator - I don't see this on my car or recall it in my shop manual, which is packed away for our move. Is this something added on the later cars? I've had fuel pressure issues for a while and even after replacing the pump and regulator it still wasn't holding pressure. I just changed the filter as part of my current projects but I'll scan for this as well. Thought my issue was a leaking injector so I cleaned those as well as part of my current project too.
85WHITEZ51 is offline  
Old 12-26-2018, 01:01 AM
  #47  
vermatrix
Junior Member
 
Member Since: Jul 2018
Posts: 47
Thanks: 0
Thanked 3 Times in 1 Post
Default

Originally Posted by Nokones View Post
I'm curious on which Minram are you referring to:

This one?


or this one?

Thats just SEXY. Is that yours? Is that a 383?
vermatrix is offline  
Old 12-26-2018, 01:05 PM
  #48  
Capt Mike
CF Senior Member
 
Capt Mike's Avatar
 
Member Since: Jan 2015
Location: Oregon
Posts: 199
Thanked 12 Times in 11 Posts
Default

85WHITEZ51,,

I know, it can be annoying at times. Have you verified a low or Dipping Fuel Pressure while the engine is running ??

I don't have an issue with holding fuel pressure on my C4 Convert, it's the initial fuel pressure priming that's on the Blink someplace. Like I wrote, I'll probably just installed a push button switch in the drivers area and use that to engage that fuel prime relay,. I've never found this accumulator is my C4 nor on a few others, both the TPI and LT1 models as shown on the diagram. I've tested with a fuel pressure gauge on the fuel rail and that's fine, we even strapped the fuel pressure gauge o the windshield and propped up the hood so We could test drive, good. But the prime circuit is def the problem on my C4...It's been so long ago I don't quite remember how Steve (life long friend and also Engineer) made a fuel line Plug so We could disconnect the fuel pressure line at the engine pressure held .. When I inspected the relay Wiring, the Hot wire to the fuel pump was fried. Replacing the this relay and wiring pig tail was only short success. This worked for a few months and then became intermittent, that soon fell to a failure on this fuel pump prime circuit. Had enough,, manual prime switch at thus point in time !! I'm going to upgrade to a LS ECM and Vette wiring harness, going to the sequential injector firing and a much better ECM.

-- You might try capping off he pressure side on the fuel line and the engine, like we did, to determine if the pressure loss is before of after this point. I've seen fuel pressure issues even with new pumps, and electrical supply to EFI pumps too.

I recently helped a friend install a very low mile (32K) -95 Vette LT1 into his wife's '73 Euro Mercedes Convert. The engine price was $1000 with a new Hewell ECM and wiring harness. My friend had paid a Shop $$$ to do the job, but half way through they told him to come get his Merk. So we gutted their work and started over again, one of those Saturday only projects. It's a very low mile Covert, just mint condition and Its all black, so why not.

To the Point, There is only one issue, occasionally when stopping at a Traffic light or stop sign, the RPM drops and sometimes the engine dies.
I've been through the fuel system and Vacuum system,, at the build,,,new pressure reg, pump, and injectors, all new Vac lines,.. So I'm at the point Vacuum or Fuel ,,, which ?? For now We'e on hold until next Spring.... The plan is to drive this Frankenstein and start with a Vac Gauge inside so we can watch, and see if the Vacuum pressure drops when applying the brakes. I'm hopping this isn't a fuel problem !!

Good Luck, let me know if you have any ides or if you get yours figured out..

Michael....
Capt Mike is offline  
Old 01-11-2019, 12:33 PM
  #49  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

Asking the pro's here. The braided hose lines from TPIS were made to connect to the factory hard lines at the front of the engine. While looking at the car I noticed that their is a clear path to the hard line connections at the fuel filter. I was 100% planning on connecting to the hard lines at the front of the engine then I realized that they are only 80% hard lines and have rubber hose in the middle to allow for flexibility. That hose has got to be getting worn down as it's been on the car since new. What are the thoughts about removing that porting and just getting some longer fuel line and connecting the rails to the joints by the fuel filter? I noticed the return line is spliced their as well from the factory.

This worth while or am I overthinking things?

Also, dumb question but will ask to be 100% sure since the instructions don't state it. The feed line is where the Fuel pressure regulator and the other side is the return, right? It's obvious on the hard lines as they are different sizes but on the rail itself they are the same fittings so I wanted to be 100% I hooked it up right.
85WHITEZ51 is offline  
Old 01-11-2019, 12:34 PM
  #50  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

I should add. If tapping into the hard lines by the filter is best, anyone know the correct fittings already? If not, I'll start that research but rather not re-invent the wheel unless a need to.
85WHITEZ51 is offline  
Old 01-11-2019, 01:49 PM
  #51  
cardo0
CF Senior Member
 
cardo0's Avatar
 
Member Since: Oct 2002
Location: Las Vegas - Boycott Hypocrisy!
Posts: 6,130
Thanked 196 Times in 187 Posts
Default

Originally Posted by Capt Mike View Post


Hardtop convertibles are just to cool. I think they're worth good money for upgrades if you want them as that's a car anyone would like to show off.

Nice car and wish I had one.
cardo0 is offline  
Old 02-11-2019, 02:39 PM
  #52  
85WHITEZ51
CF Senior Member
Thread Starter
 
85WHITEZ51's Avatar
 
Member Since: Dec 2000
Location: Leander TX
Posts: 1,422
Thanked 3 Times in 3 Posts
Default

Finally got out to the shop and made some progress on the car. At this point, plumbing the fuel system is about all that is left. I bought what I thought would work but the fuel pressure regulator side wont work so I'm having to find another solution.

Dang near everything is new under the hood now. I just hope it all works and my car finally stops leaking fluids now, too...


85WHITEZ51 is offline  
The Following User Says Thank You to 85WHITEZ51 For This Useful Post:
rharker (02-11-2019)
 


Thread Tools
Search this Thread
Quick Reply: Thoughts on Miniram for 85 with ZZ4


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: