P-pump & electronics - Competition Diesel.Com

OilfieldOutlaw · 07-07-2019, 08:34 PM

I just spent the last 2 hours reading about p-pumped 24valves. There is a vast amount of information on this site! I am curious about how the sensors work after doing this swap. I just purchased a 98.5 that has been p-pumped and I currently have no tach or AC. After the last 2 hours I now know that the 2 are related, but I'm wondering in what way? Could someone explain the relationship of a crankshaft sensor to AC & the tach?

I plan on replacing the crankshaft sensor for piece of mind, after replacing battery terminals everything else seemed to start working again. I don't know about if everything is accurate, but after an hour or so of driving the gauge cluster finally seemed to work properly.

If a new sensor doesn't fix the issue, I'm jot sure what the issue would then be.

Thank you in advance!

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BigPapa · 07-07-2019, 09:38 PM

In basic layman’s terms, the crank sensor provides the signal to the tach AND tells the PCM that the engine is running. The PCM commands the alternator and the A/C on when it senses the engine is running.

OilfieldOutlaw · 07-07-2019, 10:08 PM

Thank you, what other nuances are to be expected in doing a p-pump on a 24valve? I feel like a kid learning something new. I didn't realize so much of the electrical system was unnecessary, unless you want gauges to work.

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BigPapa · 07-08-2019, 07:14 AM

Do you have a manual or auto tranny?

OilfieldOutlaw · 07-08-2019, 07:36 AM

It was born an auto, but now has a G56 manual.

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BigPapa · 07-08-2019, 09:42 AM

I believe you'll be fine just replacing the crank sensor. The 24V APPS would come into play if you had an auto.

You will always have a CEL since the VP44 is gone.

OilfieldOutlaw · 07-08-2019, 04:57 PM

Went to the parts store, bought a CPS for a 24V, pulled the starter and there was a plate where the sensor would be. Got to poking around online, saw a sensor for a 97/98 12V and verified on my truck that I do indeed have a 12V CPS/ESS.

This truck confuses me.

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BigPapa · 07-08-2019, 10:06 PM

Is the ECM still there?

kxhonda · 07-08-2019, 11:26 PM

That looks to be an 01-02 block that doesn't have a tone wheel on the crank. Need to pull that plastic and see if there's a tone wheel in there. If that's the case then someone tried using a 12v damper and sensor which will not work because the ecm is looking for a 36 -1 signal.

OilfieldOutlaw · 07-09-2019, 06:07 PM

No, there is no ECM on this truck

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kxhonda · 07-09-2019, 06:43 PM

Your gonna need one if you want the oem tach to work.

OilfieldOutlaw · 07-09-2019, 07:45 PM

Tach & AC?

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OilfieldOutlaw · 07-09-2019, 07:46 PM

Tach doesn't bother me too much, AC does. It was 104 today in west TX.

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BigPapa · 07-09-2019, 08:10 PM

Sounds like you’ve got a Frankenram. Get us the number off your PCM. We can tell from that if you have a PCM for the ‘98 12V or the ‘98.5 24V. The 12V PCM gets all it’s info straight from the sensors. The 24V PCM gets it’s info from the ECM which gets it’s info from the sensors. That ESS for the 12V will not work with the 24V PCM to make your tach, alternator, and A/C work.

OilfieldOutlaw · 07-09-2019, 09:13 PM

For what it's worth the alternator seems to be functioning. I drove it 45 mins to the house after buying it, a week or so later I fired it up and drove it around town for a bit. Then after sitting 2 weeks, I replaced passenger side battery terminals and it fired up just fine again, I drove it around maybe a total of 45 minutes with no issues.

Here are pics of the pcm

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BigPapa · 07-09-2019, 11:30 PM

That PCM is for a ‘98 12V 5-speed.

OilfieldOutlaw · 07-10-2019, 05:13 AM

So, I assume the sensor is bad and theoretically replacing it should fix the tach/AC issue?

A 98 12V with a 5 speed... Wtf lol

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BigPapa · 07-10-2019, 06:03 AM

No way anyone could say that for sure. WAY too many variables here. It all depends on what the PO did to it.

That said, yes, IF that ESS is bad, IF that’s the only problem, IF the PO did it right, it SHOULD fix the tach and the A/C.

dieselbeef · 07-10-2019, 06:05 AM

I'm in on this...and you boys wanna know why I put up with the vp...lol..this is why

WUnderwood · 07-10-2019, 08:32 AM

oilfield- do you know who did the swap?

What city are you in?

07-07-2019, 08:34 PM	#1
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	P-pump & electronics I just spent the last 2 hours reading about p-pumped 24valves. There is a vast amount of information on this site! I am curious about how the sensors work after doing this swap. I just purchased a 98.5 that has been p-pumped and I currently have no tach or AC. After the last 2 hours I now know that the 2 are related, but I'm wondering in what way? Could someone explain the relationship of a crankshaft sensor to AC & the tach? I plan on replacing the crankshaft sensor for piece of mind, after replacing battery terminals everything else seemed to start working again. I don't know about if everything is accurate, but after an hour or so of driving the gauge cluster finally seemed to work properly. If a new sensor doesn't fix the issue, I'm jot sure what the issue would then be. Thank you in advance! Sent from my LM-G820 using Tapatalk

07-07-2019, 09:38 PM	#2
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	In basic layman’s terms, the crank sensor provides the signal to the tach AND tells the PCM that the engine is running. The PCM commands the alternator and the A/C on when it senses the engine is running. __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it. Last edited by BigPapa; 07-07-2019 at 09:39 PM.

07-08-2019, 07:14 AM	#4
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	Do you have a manual or auto tranny? __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-08-2019, 09:42 AM	#6
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	I believe you'll be fine just replacing the crank sensor. The 24V APPS would come into play if you had an auto. You will always have a CEL since the VP44 is gone. __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-08-2019, 10:06 PM	#8
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	Is the ECM still there? __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-07-2019, 10:08 PM	#3
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	Thank you, what other nuances are to be expected in doing a p-pump on a 24valve? I feel like a kid learning something new. I didn't realize so much of the electrical system was unnecessary, unless you want gauges to work. Sent from my LM-G820 using Tapatalk

07-08-2019, 07:36 AM	#5
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	It was born an auto, but now has a G56 manual. Sent from my LM-G820 using Tapatalk

07-08-2019, 04:57 PM	#7
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	Went to the parts store, bought a CPS for a 24V, pulled the starter and there was a plate where the sensor would be. Got to poking around online, saw a sensor for a 97/98 12V and verified on my truck that I do indeed have a 12V CPS/ESS. This truck confuses me. Sent from my LM-G820 using Tapatalk

07-08-2019, 11:26 PM	#9
kxhonda Name: kxhonda Title: Too Much Time Status: Not Here Join Date: Feb 2007 Location: Warsaw, IN Member`s Gallery Posts: 393	That looks to be an 01-02 block that doesn't have a tone wheel on the crank. Need to pull that plastic and see if there's a tone wheel in there. If that's the case then someone tried using a 12v damper and sensor which will not work because the ecm is looking for a 36 -1 signal. __________________ Eric Beverly 1999 3500 Ext. Cab, 5spd, 13mm pump, 6x16's, A1000

07-09-2019, 06:07 PM	#10
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	No, there is no ECM on this truck Sent from my LM-G820 using Tapatalk

07-09-2019, 06:43 PM	#11
kxhonda Name: kxhonda Title: Too Much Time Status: Not Here Join Date: Feb 2007 Location: Warsaw, IN Member`s Gallery Posts: 393	Your gonna need one if you want the oem tach to work. __________________ Eric Beverly 1999 3500 Ext. Cab, 5spd, 13mm pump, 6x16's, A1000

07-09-2019, 07:45 PM	#12
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	Tach & AC? Sent from my LM-G820 using Tapatalk Last edited by OilfieldOutlaw; 07-09-2019 at 07:47 PM.

07-09-2019, 07:46 PM	#13
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	Tach doesn't bother me too much, AC does. It was 104 today in west TX. Sent from my LM-G820 using Tapatalk

07-09-2019, 08:10 PM	#14
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	Sounds like you’ve got a Frankenram. Get us the number off your PCM. We can tell from that if you have a PCM for the ‘98 12V or the ‘98.5 24V. The 12V PCM gets all it’s info straight from the sensors. The 24V PCM gets it’s info from the ECM which gets it’s info from the sensors. That ESS for the 12V will not work with the 24V PCM to make your tach, alternator, and A/C work. __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-09-2019, 09:13 PM	#15
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	For what it's worth the alternator seems to be functioning. I drove it 45 mins to the house after buying it, a week or so later I fired it up and drove it around town for a bit. Then after sitting 2 weeks, I replaced passenger side battery terminals and it fired up just fine again, I drove it around maybe a total of 45 minutes with no issues. Here are pics of the pcm Sent from my LM-G820 using Tapatalk

07-09-2019, 11:30 PM	#16
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	That PCM is for a ‘98 12V 5-speed. __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-10-2019, 05:13 AM	#17
OilfieldOutlaw Name: OilfieldOutlaw Title: Rookie Status: Not Here Join Date: Jul 2019 Member`s Gallery Posts: 13	So, I assume the sensor is bad and theoretically replacing it should fix the tach/AC issue? A 98 12V with a 5 speed... Wtf lol Sent from my LM-G820 using Tapatalk

07-10-2019, 06:03 AM	#18
BigPapa Name: BigPapa Title: Truckless Status: Not Here Join Date: Jan 2008 Location: Springfield, TN Member`s Gallery Posts: 5,034	No way anyone could say that for sure. WAY too many variables here. It all depends on what the PO did to it. That said, yes, IF that ESS is bad, IF that’s the only problem, IF the PO did it right, it SHOULD fix the tach and the A/C. __________________ Scott 2003 Avalanche Z71 Common sense is like deodorant. The people that need it most never use it.

07-10-2019, 06:05 AM	#19
dieselbeef Name: dieselbeef Title: dick doggin Status: Not Here Join Date: Jul 2007 Location: myakka city florida Member`s Gallery Posts: 9,860	I'm in on this...and you boys wanna know why I put up with the vp...lol..this is why __________________ 02 quad cab 4x4 aluminum flatbed 63/68/14 hrvp INJ by weston 4.10 gorend/suncoast method race 01 2500 4x4 quad cab all stock/drag comp 07.5 3500 4x4 dually 4 dr 6.7 d&j extreme, fleece cheetah, gorend triple, cat filters, rip wrongway...

07-10-2019, 08:32 AM	#20
WUnderwood Name: WUnderwood Title: CompD Minion Status: Not Here Join Date: Aug 2006 Location: Texas Member`s Gallery Posts: 8,418	oilfield- do you know who did the swap? What city are you in? __________________ 2011 Ford F-150 Lariat 4X4 RIP BFD99, jponder, and Forrest Nearing