Jump to content

Upside

Members
  • Content count

    48
  • Joined

  • Last visited

Profile Information

  • Gender
    Male
  • Location
    Mill Creek, WA
  • Interests
    Boating, Motorcycles, Travel,

Recent Profile Visitors

1,132 profile views
  1. Upside

    Engine still stalls at idle...update

    also found this https://www.ebay.com/itm/Volvo-Penta-8-1L-Marine-Engine-Intake-Throttle-Body-3861008/173836220985
  2. Upside

    Engine still stalls at idle...update

    I will go remove throttle body and take pictures along the way. Buying the gasket today since it will take a couple days to arrive
  3. Upside

    Engine still stalls at idle...update

    OK Will get the Tap & Die set. Here are more pictures as requested with as many angles as I could get. https://imgur.com/a/mLEpZyg
  4. Upside

    Engine still stalls at idle...update

    Here is what I did today 1. Connected Multi-Meter to Battery. It measured 12.9v while starting. 2. Examined throttle body. Was bare and clean. It did not have too much play, similar to the other engine if not a little tighter. 3. Moved throttle and watched the plates move. They seemed to mirror the throttle and opened smoothly. Looked the same as other engine. Cleaned throttle body with carb cleaner. 4. Examined IAC wiring pins and cable. Pins seemed clean and tight. Cable showed no signs of burn or cut or anything that would indicate damage. 5. Connected Multi-Meter to IAC Cable and turned key to on. Green 11.4V Black/Yellow .40V Pink/Blue .40V Yellow/Blue 0.0V 6. Removed IAC and Examined Passage. Gently cleaned with toothbrush and some carb cleaner. There is some marring near bottom screw perhaps from previous mechanics attempts to remove/replace IAC. 7. Went to replace IAC and noticed the top screw was not tightening. Tried different screw and it was also stripping, indicating the problem is actually inside the throttle body. The IAC won't tighten now. I am pretty careful so not sure how this happened or if it happened before I owned the boat. Any suggestions? Pictures of the chaos below https://imgur.com/a/eryOepw
  5. Upside

    Engine still stalls at idle...update

    May take out and put back in IAC just to make sure it's all good
  6. Upside

    Engine still stalls at idle...update

    Thst would be great. Planning to do the test tmr morning.
  7. Upside

    Engine still stalls at idle...update

    Welp, here is the afternoons update. Replaced plug wires and map sensor. It started up fine and ran for a 5 mins. Turned it off. Waited 5 mins. Tried it again and wouldn't start without some throttle. Then tested it against the other running engine going from 1500 rmp to idle. The good engine drops to idle just fine and stays 700-800 ish. The trouble engine dips way down to 300-400 when I go to idle, and then tries to recover back to idle. Sometimes it does, sometimes it dies. Either way the engine looks like it struggles for a brief second. Also the good engine seems to run just a little higher RPM at idle. When I spoke with the mechanic about this today as well as the "reseal the manifold theory" he said that when the computer was hooked up to both engines he noticed that the IAC was working but was bouncing around at much higher numbers than the good engine. As I remember it at idle the good engine would go to 0 pretty fast on the IAC readout, and on the other engine it would get there much slower if at all. My instinct would be to just adjust the idle speed screw so it idles a little faster, then it would seem to not drop so low. but of course I can't. I cannot imagine it needs another new IAC. I am trying compression test tomorrow. Will read up on manual so I can figure out how to do it. Also he said he was talking to his friend, also a mechanic of 30 yrs, and they are a little perplexed. The friend thought maybe there is a leak in the manifold gasket and the engine is sucking some air in which is throwing off the IAC. So that is where that came from. Jeff
  8. Upside

    Engine still stalls at idle...update

    Ok last thing he said the fuel pressure was fine, but he did not save the file. since it is intermittant he recommends I check the grounds on the engine while I am down today
  9. Upside

    Engine still stalls at idle...update

    Today will be first first trip to boat since it failed last and am planning to go through this list. Yes I have multimeter and am reasonably handy. I texted the mechanic asking if he saved the files and about the reasealing. His text is as follows (in response to me asking if it could be temp or oil sensors that feed map sensor): "I unplugged the temp sensor with the laptop plugged into the engine and it iddn't have any effect on the iac, plus the temp on laptop and gage on dash were the same. could be intake manifold lead causing map sensor to have bad readings. I have a call in to my rep that talks and hels a lot of shops , will see if he has anything for us to try"
  10. Upside

    Engine still stalls at idle...update

    Yes it has. I kept thinking it was the part going bad for some reason. I would replace the wiring that plugs in to it if I could find what part number and where sold Also just read this from another forum: Also check the fuel regulator, there is a screen inside that needs cleaning (or replace with an E clip) "
  11. Upside

    Engine still stalls at idle...update

    when its running it idles nice and steady. no surges
  12. Upside

    Engine still stalls at idle...update

    Ok I will go through and check these things, and I'll ask if mechanic saved the numbers he pulled. Btw when I mentioned smoke that was to say I have never seen smoke from the engine.
  13. Upside

    Engine still stalls at idle...update

    btw, THANK YOU for taking the time to help. Nothing worse than something broke sitting at a dock with nice weather. So I should have looked more carefully when replacing the plugs, I can't recall how they looked. Rookie mistake. The engine has plenty of power and sounds good when running. No oil burn. So when things are working (sporadically) it starts right up and runs in neutral and has plenty of power. perfect. When its doing this it wont start unless I give it some throttle, and then dies when I go in to neutral. Yesterday after switching the map sensor it started right up. We went and got gas. Started right up again. Ran the engines for another 20 minutes, all good. Did plenty of testing from gear to idle. Then as we were coming back to dock, it died again when I went in to idle. for 5 or so minues the engine wouldn't start without throttle and would die when I put in idle. Then magically it started working again and I docked it. That is the biggest issue. It will work all day sometimes, then not. Usually doesn't work when I need it to most, like docking in the wind lol. When its working it isn't blowing smoke and seems to have good power and steady rpms with temps similar to my other engine. I did buy new fuel filter today and have new map sensor arriving (since I used the one from other engine) Also going to order the park plug wires right now for both engines. The person behind counter also said I could test some computer where the throttle goes in to? He said that could be culprit on the 8.1s. Make any sense?
  14. Upside

    Engine still stalls at idle...update

    There is no distributor cap or rotor on the 8.1l EFI according to the parts counter at my local marine store. He recommended compression test. Would compression show on the laptop testing?
×