1989 running rough
Thread Starter
Intermediate
Joined: Nov 2010
Posts: 46
Likes: 0
From: Hampstead NC
1989 running rough
I just bought this 89 with very low miles and usage. It had 1/4 tank of gas when I bought it and I added a pint of injection cleaner and filled it with premium. I drove it sbout 100 miles it ran rough when the engine was loaded down at low RPM's but was fine once it got up to speed. I stopped and turned the car off and then it would start but with no power and it would stall right off. After it sat for an 1 hour or so it started right up and ran pretty much as it had before the stop.
I'll start by changing the fuel filter but I'd like some opinions I what else I should do to get it running right.
As background this car has only 13K miles on it and has not been driven much. I would appreciate any other recommendations folks have for setting right. I will change all the fluids, lube it etc. But are there non obvious things I should be checking on?
Thanks
I'll start by changing the fuel filter but I'd like some opinions I what else I should do to get it running right.
As background this car has only 13K miles on it and has not been driven much. I would appreciate any other recommendations folks have for setting right. I will change all the fluids, lube it etc. But are there non obvious things I should be checking on?
Thanks
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Congrats on the purchase! 
Fist, you might try to see if the car has any stored trouble codes. Here is a link to a thread/post (post number 18) that will help you to pull any stored codes: http://forums.corvetteforum.com/c4-g...ps-w-pics.html
A bunch of '89s' have problematic fuel injectors (Multech injectors - non ethenol compliant) issues when using ethenol blended gas.
Fist, you might try to see if the car has any stored trouble codes. Here is a link to a thread/post (post number 18) that will help you to pull any stored codes: http://forums.corvetteforum.com/c4-g...ps-w-pics.html
A bunch of '89s' have problematic fuel injectors (Multech injectors - non ethenol compliant) issues when using ethenol blended gas.
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
fuel injectors are a given...almost without question, replace fuel filter (keep originals of injectors and fuel filter OR GIVE THEM TO ME for NCRS rebuild) also consider checking rubber vacuum lines if it was sitting outside.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Its a known fact that fuel injector cleaner is not to be used on Multec injectors. Don't feel bad, I made the same mistake when I got my 89 Vette and before I started asking questions on the Corvette Forum...
..WW
..WW
Thread Starter
Intermediate
Joined: Nov 2010
Posts: 46
Likes: 0
From: Hampstead NC
Thanks for the feedback
Well it's probably not the first mistake I will make. But I appreciate the replies and information. Is there a particular type of injector I should buy? How can I make sure that the new one will run with Ethanol?
Also can I simply replace them or are there calibrations required once the new ones are in?
Also can I simply replace them or are there calibrations required once the new ones are in?
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
Well it's probably not the first mistake I will make. But I appreciate the replies and information. Is there a particular type of injector I should buy? How can I make sure that the new one will run with Ethanol?
Also can I simply replace them or are there calibrations required once the new ones are in?
Also can I simply replace them or are there calibrations required once the new ones are in?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
