Car has spark but No pulse to fuel Injectors
#1
Car has spark but No pulse to fuel Injectors
2004 Mazda Rx8, 6 port
Recently rebuilt the engine
Checked all of the fuses
Checked all of the grounds
Checked the forums for a similar issue with no luck
Everything else is working. Fuel pump works just fine.
Any help would be appreciated.
Recently rebuilt the engine
Checked all of the fuses
Checked all of the grounds
Checked the forums for a similar issue with no luck
Everything else is working. Fuel pump works just fine.
Any help would be appreciated.
#2
I recently performed an engine swap and had a similar issue. I had spark and fuel pressure but no start. My injectors had gumbed up from sitting for so long. I swapped them with fresh injectors and the car started right up.
Make sure you are getting injector pulse. Check with a test light. Verify you have injectors hooked up correctly. You can check to see if the injectors cycle with a 9 volt battery, listen for a click. Check cel codes. Check maf voltage. Double check all connections.
Make sure you are getting injector pulse. Check with a test light. Verify you have injectors hooked up correctly. You can check to see if the injectors cycle with a 9 volt battery, listen for a click. Check cel codes. Check maf voltage. Double check all connections.
#4
#10
next step, if not done, would be check relays and cleanliness of all connections. See attached link for a diagnostics file
http://jmp.sh/wmBjaSc
http://jmp.sh/wmBjaSc
#16
The B+ that was mentioned is a voltage that should match the voltage of the positive terminal of the battery.
#19
The injectors all get power from the same fuse......and the same feed.....they trigger by being grounded...
If you don't have B+ at the injector it means there is an interruption in the circuit...either the fuse....a feed relay...or a problem with the wire itself
If you don't have B+ at the injector it means there is an interruption in the circuit...either the fuse....a feed relay...or a problem with the wire itself
#20
have you actually checked that there is fuel getting to chambers ? IE are spark plugs wet and do you get a mist when turning over the engine with plugs out .
If so ........... are you sure it isn't just flooded ?
If so ........... are you sure it isn't just flooded ?
#21
Brettus Well ............ you should only be getting a pulse from the reds and only when engine is turning over ..................
So I should have 2 injectors active on idle, 4 others not.
I connected my computer to the Mazda ECU and it reads that 4 injectors are active. They values are not doubled, each injector has its own value.
How can my Renesis HP run on 4 injectors, 4ms each on 800rpm and have a 42% engine load? It's terribly hard to start, it floods, and it would atleast explain alot. When I add throttle a bit (adding more air) it also start better. When I finally start it, it just sends out a giant cloud of unburned fuel, sputters into the 3000rpm and my neighbours closed their windows from the gasoline smell.
Right here in the same program you can see that at Idle only 2 injectors are active. Why are there 4 active in mine then??? Is it a PCM update or what?
I might strongly consider just disconnecting Primary 2 and Secondary injectors and see how the car starts then. I also get ticking from the engine bay which according to many is a stuck SSV valve. Could it be stuck open and activating the Primary 2 injectors?
Last edited by TomX8; 07-26-2017 at 04:17 PM.
Thread
Thread Starter
Forum
Replies
Last Post
dbarber
Series I Trouble Shooting
14
07-25-2015 01:34 PM