no power to fuel pump????
#21
Contributing Member
#24
Registered User
Thread Starter
Join Date: Feb 2009
Location: British Columbia
Posts: 262
Likes: 0
Received 0 Likes
on
0 Posts
#25
Registered User
Join Date: Mar 2008
Location: Temecula Valley, CA
Posts: 12,723
Likes: 0
Received 5 Likes
on
5 Posts
It's a special test light, often referred to as a 'noid' light, that plugs into the injector plug and flashes on and off when there is a pulse for the injectors. you plug it in and watch the light while someone cranks the engine. If it doesn't flash, you're not getting a pulse to fire the injectors. If you go to buy one, make sure you get one compatible with type "C" injectors.
And for other reference- all 4 injectors fire at the same time, once per engine revolution. Even though the wiring diagram suggests differently around the ECU, you'll find that bank 1 and 2 are tied together in the harness near the intake manifold, so you don't necessarily have to test all 4 injector plugs for a signal.
And for other reference- all 4 injectors fire at the same time, once per engine revolution. Even though the wiring diagram suggests differently around the ECU, you'll find that bank 1 and 2 are tied together in the harness near the intake manifold, so you don't necessarily have to test all 4 injector plugs for a signal.
#26
Registered User
Thread Starter
Join Date: Feb 2009
Location: British Columbia
Posts: 262
Likes: 0
Received 0 Likes
on
0 Posts
ok, i'll try to listen for the clicks tomorrow, sounds like a cheaper way to rule out the injectors. if it turns out that i am not getting any signal to the injectors would that point to a faulty ECM? and would that require replacement?
oh and my truck is a V6 if that changes anything.
oh and my truck is a V6 if that changes anything.
#29
Registered User
Thread Starter
Join Date: Feb 2009
Location: British Columbia
Posts: 262
Likes: 0
Received 0 Likes
on
0 Posts
i did have recent problems with the distributor cap. i guess when i installed the cold air intake i must have put some force on the coil wire cuz it broke off at the cap. so replaced everything - plugs, wires, rotor and cap.
actually it was after i'd changed out the rotor (got it a day after everything else) that the truck stalled, while i was moving from our shop to the carport. but, i did check to make sure the rotor was rotating and that i got the wires in the right order. i did also check for spark. so i think that rules out the igniter and wiring.
just to re-cap, here is a list of what i have tried:
-fuel pump - works
-fuel filter - replaced
-ignition switch replaced (not really related)
-AFM cleaned with throttle body cleaner
-bypassed COR and AFM - turns on fuel pump
-checked connections and wiring from COR back to pump
-found EFI relay to be faulty - bypassed still no start
-cold start injector - fuel to injector rail
actually it was after i'd changed out the rotor (got it a day after everything else) that the truck stalled, while i was moving from our shop to the carport. but, i did check to make sure the rotor was rotating and that i got the wires in the right order. i did also check for spark. so i think that rules out the igniter and wiring.
just to re-cap, here is a list of what i have tried:
-fuel pump - works
-fuel filter - replaced
-ignition switch replaced (not really related)
-AFM cleaned with throttle body cleaner
-bypassed COR and AFM - turns on fuel pump
-checked connections and wiring from COR back to pump
-found EFI relay to be faulty - bypassed still no start
-cold start injector - fuel to injector rail
Last edited by sinneDBTB; 03-01-2009 at 07:18 PM.
#30
Registered User
Thread Starter
Join Date: Feb 2009
Location: British Columbia
Posts: 262
Likes: 0
Received 0 Likes
on
0 Posts
i went to the wreckers today and poached a few parts for my truck. i got a COR and a EFI relay for $10! plus a handful of hardware i pocketed. irony is that the fuel pump in my dads truck went when i was trying to leave. my luck!
so i got home finally and plugged the EFI relay in and tried to turn the engine over with no luck. then i tried the COR, it didn't want to but i got her started FINALLY!
so all that head scratching and un-necessary work lead me right to 2 parts i got for $1o that just plug in.
thanks to everyone who offered some input.
what a great resource this site is!
but i have a new issue... my truck seems to kinda pop from the exhaust like a small backfire, but you dont notice it from the engine itself. also when i dump the throttle its like theres a backfire in the AFM. it sounds like a big bang of the sensor slamming.
anybody have any suggestions?
so i got home finally and plugged the EFI relay in and tried to turn the engine over with no luck. then i tried the COR, it didn't want to but i got her started FINALLY!
so all that head scratching and un-necessary work lead me right to 2 parts i got for $1o that just plug in.
thanks to everyone who offered some input.
what a great resource this site is!
but i have a new issue... my truck seems to kinda pop from the exhaust like a small backfire, but you dont notice it from the engine itself. also when i dump the throttle its like theres a backfire in the AFM. it sounds like a big bang of the sensor slamming.
anybody have any suggestions?
Thread
Thread Starter
Forum
Replies
Last Post
GreatLakesGuy
The Classifieds GraveYard
8
09-04-2015 09:27 AM
TURBOrunnerNM
86-95 Trucks & 4Runners
4
07-22-2015 11:01 AM