*** Restricting New Posts to SD Premium Members ONLY *** (09 May 2025)
Just made a new account? Can't post? Click above.
Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
1998 Ford F-150 v6 4.6 Engine with No injector pulse
- Da Beginner
-
Topic Author
- Offline
- Junior Member
-
Less
More
- Posts: 34
- Thank you received: 0
8 years 4 months ago #9589
by Da Beginner
1998 Ford F-150 v6 4.6 Engine with No injector pulse was created by Da Beginner
Working on this truck a few days now. The truck just cut off while driving. It blown the number 19 main fuse (this was for the fuel pump} it was replace and now the truck wont start. We connect the scan tool and getting no reading from the obd2, I check the power and ground, they are good. we check for spark, it's good. The pump will prime sometime so we jumped it and found-out that there's no pulsing from the injectors
got the ford wiring diagram to check the camshaft sensor out because i know most of the time it the cam that controls the injector pulse but I don't really understand it like that. You see am Just learning, trying to get in this field, but anyways I'm seeing the wiring that goes to the computer from the cam sensor and another going to the knock sensor. I put the probe on the one that saying cam pos in but not getting any waveform. On the crank I saw one of Paul's video on the 4.6 and was able to connect the scope to the crank positive and negative to get a good waveform. Oh I have power on both wire on the injectors but the computer not pulling them to ground. I hope this is enough info to get some feedback, please if you need more just let me know what you need, I'm grateful for any and every bit of help I can get. I've attach a picture of the cam sensor after testing it again.
got the ford wiring diagram to check the camshaft sensor out because i know most of the time it the cam that controls the injector pulse but I don't really understand it like that. You see am Just learning, trying to get in this field, but anyways I'm seeing the wiring that goes to the computer from the cam sensor and another going to the knock sensor. I put the probe on the one that saying cam pos in but not getting any waveform. On the crank I saw one of Paul's video on the 4.6 and was able to connect the scope to the crank positive and negative to get a good waveform. Oh I have power on both wire on the injectors but the computer not pulling them to ground. I hope this is enough info to get some feedback, please if you need more just let me know what you need, I'm grateful for any and every bit of help I can get. I've attach a picture of the cam sensor after testing it again.
Please Log in or Create an account to join the conversation.
- cheryl hartkorn
-
- Offline
- Platinum Member
-
Less
More
- Posts: 692
- Thank you received: 130
8 years 4 months ago #9601
by cheryl hartkorn
Replied by cheryl hartkorn on topic 1998 Ford F-150 v6 4.6 Engine with No injector pulse
no communication with the scanner?? does the check engine light light with the key on?? trying to get a starting point. sounds like a theft issue. if you have spark but no pulse
Please Log in or Create an account to join the conversation.
- Da Beginner
-
Topic Author
- Offline
- Junior Member
-
Less
More
- Posts: 34
- Thank you received: 0
8 years 4 months ago #9617
by Da Beginner
Replied by Da Beginner on topic 1998 Ford F-150 v6 4.6 Engine with No injector pulse
you are so right. there no check engine and anti-thief lights on the dash.where do I go from there?
I have good cam and crank wave forms but just no injector pulse
I have good cam and crank wave forms but just no injector pulse
Please Log in or Create an account to join the conversation.
- Da Beginner
-
Topic Author
- Offline
- Junior Member
-
Less
More
- Posts: 34
- Thank you received: 0
8 years 4 months ago #9620
by Da Beginner
Replied by Da Beginner on topic 1998 Ford F-150 v6 4.6 Engine with No injector pulse
So I tried the verus again to see if I could communicate with any other module and was able to with everything other then the anti brake and pcm. I tested all the power and grounds. All passed so I did a resistance check on all the ground all pass but pin 76 on the ECM with had 342.5 pin 76 runs to pin 87 on the ecm relay with runs power to the fuel pump from the ecm pin 80.
Please Log in or Create an account to join the conversation.
- cheryl hartkorn
-
- Offline
- Platinum Member
-
Less
More
- Posts: 692
- Thank you received: 130
8 years 4 months ago #9629
by cheryl hartkorn
Replied by cheryl hartkorn on topic 1998 Ford F-150 v6 4.6 Engine with No injector pulse
maybe try unplugging the abs module? might be messing with the communication network. any codes in other modules??
Please Log in or Create an account to join the conversation.
- cheryl hartkorn
-
- Offline
- Platinum Member
-
Less
More
- Posts: 692
- Thank you received: 130
8 years 4 months ago #9630
by cheryl hartkorn
Replied by cheryl hartkorn on topic 1998 Ford F-150 v6 4.6 Engine with No injector pulse
also are you getting power to the fuel pump? if not id be tempted to jump pins 30 and 87 on the ecm relay. also i never ohm check grounds i load them with a test light or a test light
Please Log in or Create an account to join the conversation.
Time to create page: 0.402 seconds