How do you test injectors?
10-16-05, 12:32 AM
#1
Full Member
Thread Starter
Join Date: Sep 2004
Location: Louisville, Ky
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
How do you test injectors?
What is a good way to verify that the primary injectors are firing? I have fuel pressure to the primary fuel rail but I am not getting fuel to the engine.
10-16-05, 01:11 AM
#2
MP T-70 = Fun
Join Date: Dec 2004
Location: Charlotte and WCU
Posts: 1,049
Likes: 0
Received 0 Likes
on
0 Posts
reted posted a simple and crude way...
pull the rail and injectors but leave the fuel like connected.
zip tie the injectors in place into the rail.
have a friend turn the key and see if it sprays. it should be even sprays.
if one is more then the other or one works and the other does not... then its time to send them off or buy a new set.
pull the rail and injectors but leave the fuel like connected.
zip tie the injectors in place into the rail.
have a friend turn the key and see if it sprays. it should be even sprays.
if one is more then the other or one works and the other does not... then its time to send them off or buy a new set.
10-16-05, 05:01 AM
#4
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
That's a not a "crude" way, it's the correct way. Go read the FSM. That's more to test the spray pattern though. If you just want to know it they're firing, put the tip of a long screwdriver against the fuel rail and the handle against your ear. If they're firing you will clearly hear them clicking.
10-16-05, 06:35 AM
#5
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
Disable both coil assy by pulling their small white plugs off.
Either pull the cas and leave the connector on it or get a spare cas and put the cas plug on IT.
Turn the key to ON.
Spin the cas's gear rapidly. YOu should hear the injectors clicking. You leave the coils disabled so you don't hear the spark of the plugs and mistake that for the injectors clicking.
Done.
Either pull the cas and leave the connector on it or get a spare cas and put the cas plug on IT.
Turn the key to ON.
Spin the cas's gear rapidly. YOu should hear the injectors clicking. You leave the coils disabled so you don't hear the spark of the plugs and mistake that for the injectors clicking.
Done.
10-16-05, 07:56 PM
#6
MP T-70 = Fun
Join Date: Dec 2004
Location: Charlotte and WCU
Posts: 1,049
Likes: 0
Received 0 Likes
on
0 Posts
ok... so while we are on the subject. How would some one test secondarys....
Im having fuel problems im not going to get into.
There should be a simple test to see if my lean under boost problems are due to the secondarys either clogged or the wiring is bad.
i have a e6k. But ems or not.... how would someone test them? cant sit under the hood and listen to them with a screw driver while boosting.
Im having fuel problems im not going to get into.
There should be a simple test to see if my lean under boost problems are due to the secondarys either clogged or the wiring is bad.
i have a e6k. But ems or not.... how would someone test them? cant sit under the hood and listen to them with a screw driver while boosting.
10-17-05, 10:03 AM
#7
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
GO TO THE ECU AND PUT A METER ON THE PINS FOR EITHER SECONDARY. WATCH THE METER WHEN YOU GO INTO BOOST. PRIOR TO BOOST IT SHOULD READ BATTERY/ALT VOLTAGE. WHEN IT HITS BOOST, THE VOLTAGE SHOULD DROP CONSIDERABLY, SAY FROM 13VDC DOWN TO 7VDC IF YOUR REALLY ON IT.
oR IF YOUR SITTING IN YOUR DRIVEWAY, PULL THE VACUUM HOSE OFF THE BOOST SENSOR AND PLUG IT. nOW THE SECONDARYS SHOULD PULSE EACH TIME YOU REV OVER 3500 RPM. tHE VOLTAGE DROP WON'T BE AS GREAT AS THAT DESCRIBED ABOVE.
oR IF YOUR SITTING IN YOUR DRIVEWAY, PULL THE VACUUM HOSE OFF THE BOOST SENSOR AND PLUG IT. nOW THE SECONDARYS SHOULD PULSE EACH TIME YOU REV OVER 3500 RPM. tHE VOLTAGE DROP WON'T BE AS GREAT AS THAT DESCRIBED ABOVE.
Trending Topics
10-17-05, 10:12 AM
#8
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
Or If You Don't Like That, You Can Buy A Digital Meter From Radio Shack That Shows Duty Cycle. Then Just Attach It To The Wire For A Given Secondary Injector And Drive The Car In Boot While Looking At The Duty Cycle On The Meter.
10-17-05, 10:49 AM
#10
Full Member
Join Date: Oct 2004
Location: Bothell, WA
Posts: 63
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by HAILERS
Or If You Don't Like That, You Can Buy A Digital Meter From Radio Shack That Shows Duty Cycle. Then Just Attach It To The Wire For A Given Secondary Injector And Drive The Car In Boot While Looking At The Duty Cycle On The Meter.
You really need to verify that fuel is actually being delivered.
WitchHunter Performance
Fuel Injector Cleaning & Flow testing Service
10-17-05, 11:08 AM
#11
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
Originally Posted by sleeperfc
i had a thought. i could do the test the same as above. and plug the primairy injector clips on to the secondarys.
dont see why not.
dont see why not.
I DID THIS AT THE ECU A WEEK OR TWO AGO IN ANSWER TO A POST ON THIS SITE. TRUST ME, I HAD TO STAY IN THE CAR AND PLAY WITH THE THROTTLE TO KEEP IT RUNNING AT IDLE. DON'T DO IT.
PERSONALY I'VE NEVER HAD REAL PROBLEMS WITH FUEL INJECTORS, ONLY IMAGINED ONES.
VERIFY THAT THE ECU IS PULSING A SIGNAL FOR THE INJECTORS BEFORE SENDING THEM OUT TO BE FIDDLED WITH.
10-17-05, 04:11 PM
#12
MP T-70 = Fun
Join Date: Dec 2004
Location: Charlotte and WCU
Posts: 1,049
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by HAILERS
wON'T WORK. IF YOU SWAP THE PRIMARY AND SECONDARY INJECTOR PLUGS THE CAR WILL START BUT WILL RUN REAL DOGGY. i WOULDN'T EVEN DRIVE MY CAR OUT OF THE DRIVEWAY WITH IT LIKE THAT.
I DID THIS AT THE ECU A WEEK OR TWO AGO IN ANSWER TO A POST ON THIS SITE. TRUST ME, I HAD TO STAY IN THE CAR AND PLAY WITH THE THROTTLE TO KEEP IT RUNNING AT IDLE. DON'T DO IT.
PERSONALY I'VE NEVER HAD REAL PROBLEMS WITH FUEL INJECTORS, ONLY IMAGINED ONES.
VERIFY THAT THE ECU IS PULSING A SIGNAL FOR THE INJECTORS BEFORE SENDING THEM OUT TO BE FIDDLED WITH.
I DID THIS AT THE ECU A WEEK OR TWO AGO IN ANSWER TO A POST ON THIS SITE. TRUST ME, I HAD TO STAY IN THE CAR AND PLAY WITH THE THROTTLE TO KEEP IT RUNNING AT IDLE. DON'T DO IT.
PERSONALY I'VE NEVER HAD REAL PROBLEMS WITH FUEL INJECTORS, ONLY IMAGINED ONES.
VERIFY THAT THE ECU IS PULSING A SIGNAL FOR THE INJECTORS BEFORE SENDING THEM OUT TO BE FIDDLED WITH.
i never said anything about the car running. i said do the test above... was talking about pulling the rail and injectors and see if they work. if they work then i can move on to other possible causes.
so im gonna pull the secondaries and zip tie them to the rail. put the primary injector clips on to them. turn the key and see if they spray.
10-24-05, 09:31 PM
#13
Junior Member
iTrader: (1)
Join Date: Oct 2005
Location: Virginia
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
Hey sleeper: I have an 88 T2 with the same problem, I even replaced injectors with GSL-SE ones (with resistors) but still have the same problem. I did almost everything you've done. Any good hints yet?
10-27-05, 09:04 PM
#14
MP T-70 = Fun
Join Date: Dec 2004
Location: Charlotte and WCU
Posts: 1,049
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by RXORCISER
Hey sleeper: I have an 88 T2 with the same problem, I even replaced injectors with GSL-SE ones (with resistors) but still have the same problem. I did almost everything you've done. Any good hints yet?
was my injectors. swapped in a new pair and it worked. yay im fast again.
Thread
Thread Starter
Forum
Replies
Last Post
ZaqAtaq
New Member RX-7 Technical
2
09-05-15 08:57 PM
