Results 1 to 4 of 4

Thread: 6014 rough running problem.

  1. #1

    Default 6014 rough running problem.

    LQ9 with a Holley 4BBL conversion and 6014. Runs rough between 1,200 & 1,500 RPM. Very smooth otherwise. Tried two different carbs, no change. Just installed Holley Sniper EFI. Runs better, but the roughness is still present. No vacuum leaks, 20 inHg. Coolant sensor not hooked up at this time. When on read only, timing looks to be in the correct range. Any ideas? Thanks.

  2. #2
    Join Date
    Dec 2009


    An EFI system must have a coolant temperature sensor for proper operation!
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, 36-1 crank trigger, 1x cam sync, 200A 3G alternator, Optima Red battery, R134a A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM converter, B&M Hammer shifter, Stifflers trans crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3


    Should've been more specific. I have a coolant sensor hooked to the EFI, that was installed last week. I did/do not have one attached to the 6014. The 6014 instructions said it was "optional". I think I'll try running that sensor to the 6014, also. Thoughts?

  4. #4


    Pretty confident you cannot split a temperature (resistance based) sensor. A standard 0-5V signal sensor, no problem splitting it, but any type of temperature sensor that's resistance based is a no-go on splitting. There's a bias resistor within the ECU circuit that allows temperature sensors to work.
    Last edited by cpask8; 07-06-2021 at 06:41 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us