2001 5.7GSi no injector pulse please help

[Psbedoe]

No fuel coming from injectors while cranking fuel is at the injectors and pressure is good


Starts with starting fluid
Crank with a noid light no light
I have 12v on each side of the two injectors with key on
When you try to start ....when the you turn the key to on .....the noid flashes one time dimly
I have taken apart all connectors and checked all grounds
When you 1st turn key on all sounds normal and fuel pump pressures up

I replaced the control module in the distributor
Help ,,,, but

 

[alldodge]

Howdy

When you crank the motor does the tachometer move up to around 300 rpm?

 

[Psbedoe]

I have not looked but the battery is good and the crank speed sounds about as fast as it could go ... I will check tomorrow ...

Thanks

 

[Fun Times]

What is the engines full model number? GSI-??? Better yet, do you have the engine serial number handy?

You may want to try ohms checking the wire harness running between the distributor module and the coil in both directions as one of the wires should have a diode and if it fails, it could keep the injectors from firing/pulsing. Item number 39, http://www.volvopentastore.com/Igni...on_id.316456133--store_id.366--view_id.778917

A internally failed tachometer could keep the system from firing though this seems less likely since you have spark but no fuel pulses determined by the engine running when adding fuel in the throttle body. As a test you'd disconnect the gray wire at the tachometer.

Ensure all the fuses on the engine side are in working order using a multimeter on the ohms setting.
Be sure to carefully wiggle and inspect the wires throughout the EFI engine wiring harness.
The pickup coil under the ignition module might be compromised...Item # 7 in the link above. Testing should be considered before replacement. Search online videos of "How To Test The Delco HEi Pickup Coil. And/or TO: SERVICE MANAGER TECHNICIANS No. 90-15 PARTS ?

If the above seems to check out okay, It sounds like you may have lost a ground signal going to the injector wiring harness since the noid light is not lighting up. Either in the wiring, or possibly within the ECM diver.

What area do you reside in?

 

[Psbedoe]

First THANK you ! We are in central Maine .... The diode tests shorted in both diode and ohm tests.....

All the engine says on it is 5.7GSi On the model plate it is listed as a 5.7 GSI gen + I looked for the engine number on the block but my eyes will not cooperate

On the diode do you have its value ? Can I solder one in ? I don't think I could get a new harness for a few days ....

Again thank you I pulled every pinconnector apart for inspection convinced that would be the problem ...

Paul

 

[Psbedoe]

I cut the wire open its not easy to see but it looks like a resister not a diode .... If it is a resister then my reading would be good ...

 

[Psbedoe]

After looking harder it does look more like a diode but I can't identifie the colors I am hoping someone can give me the value of it

 

[Fun Times]

I went online and found where someone measured the what I call a diode as that is what I believe to have been introduced to it as but It may be a resistor or even called a filter. Don't recall exactly, just know if it's bad, the engine won't start. The quote below is from a different website that can't be linked here but if you copy and paste one of the quotes it should lead you to the other boating site where they talked about this diode, etc. a bit more that you may want to read fully. It's titled (NEED 3.0 Mercruiser Ignition HELP!!!!!!) Though it's a Merc engine, they still use this diode, etc. I believe you can even find it a GM dealer and maybe even an auto parts store but not positive on that as I haven't checked around.

The color code is a weird one. It is silver, red, red, brown, gold. I am pretty sure it is a resistor because there is no arrow on it anywhere. Have tried google for help with the resistor but couldn't find anything. I have done an ohm test on the wires and it is reading the same both ways. i guess it could be a connector issue but seems to be the resistor. I was just going to replace the resistor because it is def cheaper than buying the cable harness. It is cable harness #19 on most of the parts diagrams. BT Doctur i have gone through all of those instructions and have tried all those tests too. nothing working there.

Just to let everyone know. I got the new harness in and measured the resistance in the new harness and it measures 5.9 ohm from the coil to the ignition module and reads 6.8 the other way. It is wierd to me but it fixed the problem. Boat is running strong again and been out all weekend. Thanks for everyones help.

 

[Psbedoe]

Ok assuming it is a resistor .... It should read 220 ohms according to the color and assuming the leading larger silver band means military grade.

I am getting a 6 ohm reading from it I will order a new harness and see what happens ..

 

[alldodge]

silver, red, red, brown, gold

Resistors are normally read with the first three colors having the value, the forth is the multiplier. The fifth band is used for the tolerance value

The silver while not in the right order may be indicating +/- 5 % of the valve
The gold while also not in the right order could be a multiplier of 0.001 which would make it 2.20 ohms.

Now if it is read in the opposite direction it would be +/- 10 % of the value and a valve of 12.2 ohms using silver as a multiplier of 0.01

 

[Psbedoe]

I saw a link where a leading silver band twice as thick meant it was a military grade resister.... And it sure looks stronger physically than any resister I have ever seen... So that would leave red red brown gold in order after the silver.
So I came up with 220 5% on the correct ohm scale I read less then 10 ohms.... The question is does it effect the engine being that far off basically it's a straight wire with no resister..?

 

[Fun Times]

Not to sure of the values but from the other posters findings it seems that one possible way for it to fail is if the resister ohm tests reads the same both ways, it's bad but if you get different numbers such as 5.9 ohm from the coil to the ignition module then reads 6.8 the other way, it would be considered good/new.

 

[alldodge]

Just info, but the military are more concerned with failure rate and deviation in resistance. Most military grade resistors are in the 1% tolerance range, they don't use the resistor color code, they are filmed resistors and have the value stamped on them.

 

[Psbedoe]

I sent the ECU in to get tested..... They did say my boat was converted to MEFI4 from 3 .... And that the 3 control was much more reparable ....

 

[alldodge]

Who did you send it to?