Fuel Pump Relay Click On/off On Overrun???? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 07-06-2009, 11:48 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2007
Posts: 125
Total Cats: 0
Default Fuel Pump Relay Click On/off On Overrun????

Im not sure when it started, but today I noticed on the overrun, my fuel pump relay clicks on and off. This is the relay under the steering column and I can feel it click if I hold it as Im on the overrun.

It clicks on and off more-so, the harder im on the overrun. Ie. if i just lift off, it does it once or twice as the revs come down. If I engine brake hard it does it much more.

Its strange because if I so much as rest my foot against the accelerator pedal it doesnt do it, and it also doesnt seem to be affecting the way the car runs at all?! Its just really annoying?!?!

Any ideas???
DMRider_10 is offline   Reply With Quote
Old 07-06-2009, 12:04 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,915
Default

Is your stock AFM still in place?
Joe Perez is offline   Reply With Quote
Old 07-06-2009, 12:15 PM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2007
Posts: 125
Total Cats: 0
Default

yes
DMRider_10 is offline   Reply With Quote
Old 07-06-2009, 12:20 PM   #4
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,915
Default

Then what you are describing is a result of the flapper valve inside the AFM bouncing off the stop when returning to closed throttle. There's a switch inside the AFM that shuts off the relay when the flapper is fully closed. I have a datalog somewhere of this happening back when I ran an EMU before I removed the AFM.


edit: Here's the log, which shows me shifting from boost. The red line is the AFM output, the blue line is a simulation of AFM based on MAP & RPM. Remember that with the AFM, up (higher voltage) is closed.



Is there a reason your AFM is still installed?
Joe Perez is offline   Reply With Quote
Old 07-06-2009, 12:22 PM   #5
Junior Member
Thread Starter
 
Join Date: Feb 2007
Posts: 125
Total Cats: 0
Default

Any ideas on a solution then? It never used to happen?!

I dont want to remove the afm yet, cos frankly at the moment I dont trust my MS one bit, and im trying to keep the install as simple as possible to limit problem factors
DMRider_10 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:27 AM.