your post reads you changed the tank and sending unit...not the pump??? on 85 schlader valve is on passenger side rail....
85 C4 Hard Starting
Thread Starter
4th Gear
Joined: Jul 2019
Posts: 4
Likes: 0
85 C4 Hard Starting
Hey everyone,
I'm currently working to get an '85 C4 running again after sitting in my father in law's barn for about 15 years. I've replaced the fuel tank and sending unit, battery, spark plugs, distributor cap, rotor, and coil.
Even with the MAF disconnected, and cat and mufflers off since they were plugged up, the engine will crank and just briefly fire then stall out.
One curious thing I've found so far is that the TPS 5v reference is not showing any voltage when I check it with a meter. Any clues?
I'm currently working to get an '85 C4 running again after sitting in my father in law's barn for about 15 years. I've replaced the fuel tank and sending unit, battery, spark plugs, distributor cap, rotor, and coil.
Even with the MAF disconnected, and cat and mufflers off since they were plugged up, the engine will crank and just briefly fire then stall out.
One curious thing I've found so far is that the TPS 5v reference is not showing any voltage when I check it with a meter. Any clues?
Oil Producer
Joined: Apr 2014
Posts: 9,377
Likes: 2,737
why did it get parked in the barn? was there an issue previously that hasnt been recitified. that would help us help u.
- are you getting spark while turning over?
- what is your fuel pressure while cranking
- will it fire briefly on starting fluid
- have you verified timing?
there are some ideas to get started
- are you getting spark while turning over?
- what is your fuel pressure while cranking
- will it fire briefly on starting fluid
- have you verified timing?
there are some ideas to get started
Thread Starter
4th Gear
Joined: Jul 2019
Posts: 4
Likes: 0
why did it get parked in the barn? was there an issue previously that hasnt been recitified. that would help us help u.
- are you getting spark while turning over?
- what is your fuel pressure while cranking
- will it fire briefly on starting fluid
- have you verified timing?
there are some ideas to get started
- are you getting spark while turning over?
- what is your fuel pressure while cranking
- will it fire briefly on starting fluid
- have you verified timing?
there are some ideas to get started
Oil Producer
Joined: Apr 2014
Posts: 9,377
Likes: 2,737
Thread Starter
4th Gear
Joined: Jul 2019
Posts: 4
Likes: 0
I'll see what I can do about a pressure check today. Thanks for all the feedback so far!
4th Gear
Joined: Jul 2019
Posts: 4
Likes: 0
Same issue
My 89 sat for 10 having same issue. I put new injectors fuel pressure regulator filter and flushed the system. Really thought the injectors would do it. Starts on ether but won't stay. It even acts like it's going to fire then nothing. Fuel pressure is good throughout.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
4th Gear
Joined: Jul 2019
Posts: 4
Likes: 0
Just to follow up, we got it figured out after breaking out a voltmeter and going through all of the sensors again. Turned out our TPS +5V supply was intermittently going very low or completely out, so we needed to swap the ECM. I found an rebuild AC Delco unit and replaced the ECM fuse with a fresh one and it ran immediately after.
Thanks again everyone for the hints. Hope this helps you out @Majic
Thanks again everyone for the hints. Hope this helps you out @Majic