500EFI alarm
 

I'm having an issue and was hoping someone here could help steer me in the right direction. Started the boat the other day and as I was pulling away from the dock heard 2 long beeps. Oil pressure, temp and water temps all read fine. Got on plane and ran fine all day. Came back into the docks later and had the same thing happen - again all gauges read normal. Yesterday had the same thing happen but now when I shift from neutral to forward or reverse the motor seems to stall for a quick second and I get the two beeps again. Seems to idle fine in neutral. Whatever it is it seems to be getting worse. I've read the two beeps mean either high water temp, high oil temp or low oil pressure but all those numbers are fine. Any ideas?

I believe it also beeps for low drive oil in the reservoir bottle behind the engine. I had one that looked full but it was old black sludge that accomplished nothing! Take it off, clean well and re-fill.

SCX Drives so there is nothing hooked up to the drive alarm wires.

Thanks. That just show low drive oil for 2 beeps but that alarm isn't hooked up using the SCX drive bottles . . . .

500 EFI correct ????

500 efi uses a MEFI 3 controller and the 525 EFI uses PCM 555 controller not even close for faults or any of it nor beeps. Totally different controllers.

Mefi 3 has under 20 fault codes and PCM 555 has way over 200 fault codes

u need to scan the engine and look all parameters. My guess is oil pressure switch.

Thanks BUP. Planning to scan it asap to see what pops up. Would a bad oil pressure switch cause it to stall?

most efi set up's if oil psi falls below a certain # the fuel pump will be shut off. this is only bypassed during cranking.

only happens going into gear - no issues in neutral.

rpms when shifting into gear is ?

Rpms in N is ??

both engines doing the exact same thing here ? both showing the same rpms as well ?

Never stalls in N and you can throttle up and back down to idle rpm without it ever stalling in N using throttle only ?

stock OEM set up here ?

SCX drive or just gear lube bottles --- so something on the engine is not stock at all to warrrant an SCX drives if applicable . What the set up in detailed here.

How new is the IMCO drive bottles install ?

this happens on the water hose also ?

Stock ignition ?

whats the voltage readings when engines stalls ? and what is the voltage when you shift into gear ? what is voltage reading in N - still want to know what rpms are ?

rpms are 850 in neutral and 750 in gear.

rpms are 850 in neutral and 750 in gear.
Both engines show the same rpm and only having an issue with one motor.
Once I get passed the shift I have no issues throttling up or back down. Doesn't happen every time and only happens at idle.
non stock set up - 540's with Prochargers.
I've been running this motor set up with SCX drives for the past 3 seasons.
Havent run it on the hose as boats in the water.
Running MSD boxes.
Havent checked voltage yet - planning to look at it again today

Thats a whole different world for testing and trying to figure out whats wrong NOT BEING STOCK AT ALL. Nothing is stock period. Dart throwing for the fix. I did asked what was voltage readings so monitor it

is this an CARB or EFI set up ? Alot of info needs to be known to even come close for a fix.

Looks like the issue is the throttle position sensor. Anyone know if this is a standard GM part that might be available at a local auto parts store?

I was trying to be funny with is carb or efi question - attempted humor by far ----- anyways

So you scanned the engine ?

Try to mach up with an AC delco part number - I forgot what that part number is.

yes I was wondering if there was an AC Delco part #.

I really don't know (have notg replaced a Merc 500EFI tps) but it sure as heck looks like this:

ACDelco 213-894 GM Original Equipment Throttle Position Sensor
by ACDelco
Link: http://a.co/8tjywfj

https://cimg4.ibsrv.net/gimg/www.off...41b282033e.jpg

her is the factory look up:
https://www.marineengine.com/newpart...pnum=MER849903

https://cimg5.ibsrv.net/gimg/www.off...ea36940a0d.jpg

if that links to Walker 200 - 1047 that might be it but ??

I can not remember the exact ac delco #

That is the correct Merc number posted and I have those in stock.

https://www.jegs.com/i/Walker-Produc...-1047/10002/-1 possible ?? not sure

and if you look at AC delco 213- 895 will look the same as well. I am Mixed up which one it is exactly cause I only have the merc one.

thru the auto stores --- If I recall correctly One might be for a govern model used in the truck world. They look exactly the same -- govern vs NON govern.

http://www.davesdiscountautoparts.com/catalog-2/itemdetail/acdelco-gm-original-equipment/213-895?gclid=321-445409-gb&gclid=EAIaIQobChMIzc-M-PGN3AIVARxpCh0tKwvCEAYYASABEgIl-_D_BwE

From http://parts-catalog.acdelco.com/cat...tock_check.php

Put in AC delco 213- 895 you get:
(Same vehicles as Walker 200 - 1047)


Vehicle: 1995 Chevrolet K1500 5.7L V8 VIN:K
New Vehicle
Group / Subgroup: Fuel/Emissions / Fuel Inj. Sens, Rly and Switch
New Group / Subgroup :: Smart Search

Back

Next
Parts Matching Your SelectionACDELCO GM ORIGINAL EQUIPMENThttps://images.wrenchead.com/smartpa...95_Primary.jpgThrottle Position Sensor
Part Number: 213-895
Product Notes:
Throttle Position Sensor
All; REPLS 17112679)(Exc SEAL; VIN: K*
Per Vehicle: 1; Years: 1992-1995

Just saying I am not sure if it is Walker 200 1047 or which AC delco one it is either. Its either Ac delco 213-894 or 895 for the Merc 500 efi ?

So what does AC delco 213 894 match up to as far as Autos / trucks ?

CFM is a good dude.........:D

Doh, looked like you said Walker 200-1047is the one..

here are the Acdelco 213-894 vehicles:
https://www.summitracing.com/parts/a...et?prefilter=1

Thank you everyone for all the help. Really appreciate it .

So now I'm not sure the TPS is actually the problem. As I mentioned its very erractic but once I get past idle the issue goes away. I have no problems getting on plane and running 4000+ rpms. I would think if it were the TPS I'd have issues throughout the rpm range and not just at idle?

^^^That is incorrect.^^^
A TPS is just like a rheostat...it has a wiper that wipes across a circuit to change the voltage. So, you can have a deadspot.

However, since you are not checking the tps readings...how do we know ? We don't.

Kind of odd i am spending this time on trying to find the AcDelco TPS for this since you don't know.

Anyway, will be good info for my and other's parts database.

================================================== ====

Can you, or someone else, or BUP (since you have a Merc one on the shelf) if the rotor on the TPS rotates clockwise or counterclockwise as the throttle is opened.

I'm back to investigative mode.....was only able to spend some time as i was boating most of last week thru last night. :)

Okay, too funny and a little frustrating. For some reason my search engine (MSN) today pulled up an OSO thread from a few years ago that Eddie Young answered this very question. Why did my search the other day not ? I dunno. suks,

here is the thread: https://www.offshoreonly.com/forums/...on-sensor.html

So, the 500EFI uses TPS / Throttle Position Sensor:
AcDelco #213-895
GM #17106681

Mercruiser # 849903

700 SCi
565 EFI
1075 SCI
700 SCI
525 EFI
600 SCi
500 EFI
850/1025/1075/1200 SCI
SCi662 SCI

Haha no the googler screwed me up with the 894 AC delco part number. See google would have bitten you on this one.. Whatever walker 200 - 1047 was referenced to but I could not get a reference to cross for AC delco. You know I have to mess you

swap TPS from engines and run to see if issue follows or stays. You need to scan the engine regardless. Could be IAC issue in the mix or a voltage issue.

Not looking at your set up here nor the procharger set up but just throwing this out there.

By pass valve issue ?

Hey BUP, hopefully yo can take some elbowing back. :) LOl. Hahahaha

https://cimg6.ibsrv.net/gimg/www.off...f2e62c956d.gif

Of course and for me sticks and stones may break my bones but words and the finger will never hurt me nor take away from what I do. haha as well. Its all good man.

Looks like you have a fan for life there .

Ill go back to say --- swap out tps then possible IAC from the good engine one at a time to see what follows or not. And add in a scan diagnostic along with voltage readings.

NEXT If applicable ??? do not know here but will add the --- By pass valve in the mix for a possible issue ? just a dart throw at it with this

UPDATE - The issue was in fact the TPS. Put a new one in and problem solved. In case anyone is looking, the correct part number for a 500EFI is AC # 17106682. $26 at your local auto parts store vs. $175 thru Merc.