stumble at lower rpms

Corvette Forums Corvette Classifieds Gallery Corvette News Member List Search Sponsors
Forum FAQ Calendars Contact Us Corvette Recalls TSBs Corvette Timeslips Register Login

stumble at lower rpms

Printable Version

Corvette Forum >> Corvette Models >> Corvette C4 Forum >> stumble at lower rpms

Page: [1]

Message

<< Older Topic Newer Topic >>

stumble at lower rpms - 6/28/2008 6:11:24 PM

scooterman

Posts: 63
Joined: 4/16/2007
Status: offline

Here''s my issue- hoping for advice. My 94 has recently developed what I can best describe as a stumble ar miss at low rpms. no codes or pending codes. I put plugs in it about 10k ago. I was advised to replace the wires and did, but it didn''t help. It seems to run fin when cold but after warm up when you accelerate from a stop it stumbles at about 1000 rpms before it shifts into second and if I''m in traffic just keeping up at lower speeds and rpms it just doesn''t seem to run good. I''m beginning to wonder if I have an injector going bad. I just can''t tell if it''s fuel related or ignition related. Advice as always is appreciated

Post #: 1

RE: stumble at lower rpms - 7/2/2008 9:11:20 AM

LeesVette

Posts: 556
Joined: 3/24/2006
Status: offline

Have you ohmed the injectors? Checked fuel pressure? I would hook up a fuel pressure gauge and tape it to the windshield. Drive it and see what the pressure is while its in the process of stumbling.

(in reply to scooterman)

Post #: 2

RE: stumble at lower rpms - 7/3/2008 4:25:34 PM

mech259

Posts: 1745
Joined: 1/22/2006
From: Lumberton, Texas
Status: offline

With what you have done, it may be fuel related. The real way to find out is to have an injector balance test performed to see if there is any discrepancy in the performance of each injector. It can''t be done on you car without a fuel pressure gauge and an injector tester to fire each injector 50 times to measure fuel pressure drop on each cylinder.

_____________________________

L.B.
ASE Master Certified
L1 Emissions Certified
1986 C4
1969 RS Z28 Camaro
1970 Chevelle SS 396 (under construction)

(in reply to scooterman)

Post #: 3