D15B7 Will Not Start - Fuel Injector Issue?

[mirko]

ok this is the case I have a regular d15b7 and I just rebuilded, for the first start worked great ,then just stoped and it was cranking no start I checked for spark there was none so I got a new distribuitor spark came back but nothing only crank no start I checked fuel press was low so I got a new fuel pump, but still nothing , so I started all over again checked timing good ,spark good, checked fuel press good, I pulled the injectors and tried to make them spray create the impulse using a battery they sprayed alittle bit I used carb cleaner ,checked resistance is good 12 ohm all, so I put them back and did start this time engine was running great and after 5 min shut down again and nothing just cranking, so I pulled injectors again tried to make them spray but this time nothing , checked resistance again but still good i just put some carb cleaner in the gas inlet and let them soak a few minutes put them back and did start but again after like 5 min starts stalling and is on and off behind the wheel u see the rpm up and down ,hear the main relay clicking the check engine light on and off and after strugle for minutes shuts down and crankin only again.

 

[RonJ]

Replace the fuel filter.

 

[mirko]

have you ever seen a case like this before , I will try that too I dit not put attention to filter because I took fuel pressure after the filter and it was good , but the part is not expensive I will do it.

 

[RonJ]

have you ever seen a case like this before , I will try that too I dit not put attention to filter because I took fuel pressure after the filter and it was good , but the part is not expensive I will do it.

Debris in the fuel is the clogging injectors. Fuel to the injectors comes directly from the filter. Logic dictates to replace the filter, and then go from there.

 

[mirko]

I changed filter got a new set of injectors and still nothing , put voltmeter to the injector connector in one side a get batt 12 v in the other a get 2 v with ignition on , when cranking rises to 3 v is this normal, any idea how can I check if the ecu is creating pulse thank you

 

[Wreckless Hype]

I changed filter got a new set of injectors and still nothing , put voltmeter to the injector connector in one side a get batt 12 v in the other a get 2 v with ignition on , when cranking rises to 3 v is this normal, any idea how can I check if the ecu is creating pulse thank you

Were your old ones bad? Do you know how to check for click or clunk on injectors while they fire, with the car running?

 

[RonJ]

Your title and first post says the injectors are clogged. Now you are asking electrical questions. An electrical issue doesn't clog injectors, so there's some explaining to do on your part.

 

[mirko]

well the reason I am asking is cause I have fuel pres ,spark ,compression but I am not sure I got the impulse for the injectors ,I though they were cloggeg ,so I got a new set but still nothing, now I have to find out how to diagnose if the injectors get the impulse or not , should I start another thread for that question, thank you

 

[Wreckless Hype]

well the reason I am asking is cause I have fuel pres ,spark ,compression but I am not sure I got the impulse for the injectors ,I though they were cloggeg ,so I got a new set but still nothing, now I have to find out how to diagnose if the injectors get the impulse or not , should I start another thread for that question, thank you

No, keep it here, it's all related.

You do not need to buy a new set of injectors if the old ones are clogged. Are these "new" injectors brand new OEM? If not, are they new at all? If not, do you know what the condition is? You may be trying to "fix" one problem by introducing another.

There's an easy way to get a pretty good idea of the spraying function of your injector. You can use a mechanic's stethoscope to hear the sound produced by an injector. If it's clicking, it is pulsing properly. If it sounds more of a clunk, or a very light tick, there is likely an issue there. If it's an abnormal rhythm, it may be on its way out. If you don't have a mechanic's stethoscope or the $20 to buy one, I've had luck with a long screw driver with a solid plastic handle, put the end on the injector and your ear near the handle. Not perfect, but I've found a bad injector this way

 

[mirko]

I will try the screwdriver tomorrow, I need to get jumper wires ,but if it is only crancking do I still hear the click in the injectors, thank you for the tip with the screwdriver. the injectors I just put are remanufactered, new orings and seals, I HOPE they are good and if they dont click is this an issue with the ecu

 

[Wreckless Hype]

You said you could get it running for short amounts of time?

I will try the screwdriver tomorrow, I need to get jumper wires ,but if it is only crancking do I still hear the click in the injectors, thank you for the tip with the screwdriver. the injectors I just put are remanufactered, new orings and seals, I HOPE they are good and if they dont click is this an issue with the ecu

According to what? If none of them are clicking, you won't be getting fuel so your car won't be running, this doesn't make any sense. If one of them is not clicking, you'll likely be getting a misfire code since there's no combustion taking place here. Generally that means the injector is bad.

 

[mirko]

IT DID RUN a couple of times for 5 min running great then started stalling ,rpm up and down, check engine light on and off, u car hear the main clicking, after that shuts down and I have not been able to start again, I was able to cranck it a few seconds with the screwdriver touching injector and nothing any idea what can I do next

 

[RonJ]

Request that a moderator change your thread title (D15B7 won't start - possible fuel injector issue) because I now see no evidence for clogged injectors. It's misleading and wastes member's time. In the future, strive for accuracy of facts rather than jumping to false conclusions. Also edit your first post to include car information.

 

[mirko]

Well it happened the same today ,it did start for 3 minutes then stop and now it is crancking only , I checked fuel press is good , spark is good , timing good, the only thing I can think about being working bad is the ecu but I dont know what the symptoms are for a faulty computer, thank you, About changing the title souns logic , how can I contact a moderator thank you

 

[XpL0d3r]

I renamed it, no worries

In the future, you can report your own post (red ! if you're using the web and not tapatalk) and request the change. This will send an email to all staff members.

 

[mirko]

Finally. I was able to fix the problem after tracking all my electrical. Connections since I was sure it was an electrical issue. I found this little ground spot at the thermostat that I think is groud for ecu and main, and of course it started right away, thank you to all those who gave me tips to help me find out what the problem was thank you again

 

[Wreckless Hype]

Finally. I was able to fix the problem after tracking all my electrical. Connections since I was sure it was an electrical issue. I found this little ground spot at the thermostat that I think is groud for ecu and main, and of course it started right away, thank you to all those who gave me tips to help me find out what the problem was thank you again

Ah, yea, that's a pretty important ground point... Good work :