How many times does your engine "turn over" before firing?
- Thread starter Sarasota
- Start date
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Not a dumb question at all....
I too was concerned at first because it cranks more than any of my other cars, but it seems to be the norm with these rigs
I too was concerned at first because it cranks more than any of my other cars, but it seems to be the norm with these rigs
There is actually a thread roaming around about this exact same issue. I hunted it down because I was concerned about my 450, and the fact that it turns over more before firing than any other vehicle Ive owned.
Popular belief on the other thread, if my memory serves, is that it was designed that way for engine longevity. It turns over several times before firing to allow the oil pressure to build, again, according to the other thread.
Popular belief on the other thread, if my memory serves, is that it was designed that way for engine longevity. It turns over several times before firing to allow the oil pressure to build, again, according to the other thread.
Mine might turn over 3 or 4 times normally. That's still more than almost any other vehicle I've driven, my Civic usually fire first or second time over. 10-11 times would have me at least a little concerned as well.
When was the last time that you replaced any ignition components? Were they Toyota or Autozone crap?
Tony
When was the last time that you replaced any ignition components? Were they Toyota or Autozone crap?
Tony
A search will turn up a wealth of threads on this, the last one was less than a month ago IIRC.....
Edit: Yup 4-23 was the start date.
Edit: Yup 4-23 was the start date.
used to be a dead steady 6 beats, * * * * * *, seams be growing lately, needs a tune up.
the beats are pistons hitting compression so 6 beats = 2 revolutions
the beats are pistons hitting compression so 6 beats = 2 revolutions
Interesting. I was wondering the same thing about mine. Didn't realize it was a common thing.
It's easy to search "if" you know exactly what to call the problem. What do you call this, so that you don't end up with a billion worn starter contact threads?
Edit: Dont' bother with the recent thread. Here's the old thread from '04 that some are referring too:
https://forum.ih8mud.com/showthread.php?t=151505&highlight=engine+turn
and this one:
https://forum.ih8mud.com/showthread.php?t=19100
I don't think anyone's mentioned the relatively stock low compression ratio of the 1FZ and how that might affect things. I wonder.....
It's easy to search "if" you know exactly what to call the problem. What do you call this, so that you don't end up with a billion worn starter contact threads?
Edit: Dont' bother with the recent thread. Here's the old thread from '04 that some are referring too:
https://forum.ih8mud.com/showthread.php?t=151505&highlight=engine+turn
and this one:
https://forum.ih8mud.com/showthread.php?t=19100
I don't think anyone's mentioned the relatively stock low compression ratio of the 1FZ and how that might affect things. I wonder.....
Last edited:
- Thread starter
- #10
Right - I did search a few different ways to find conversation on this issue but couldn't come up with anything - probably not searching correctly. Thanks for the input / feedback anyway.
Grench
SILVER Star
Wrhoir wrhoir wrhoir vrOOOOoooooooooooooooom. So does that count as 3 or 4? Both of my '96s. It takes a bit to get used to the startup racing engine too.
Hants
SILVER Star
When I first got mine, it was about 8. After a complete tuneup and BG44K treatment (done all at the same time), it was around 4-5. After my HG, its normally 1-2.
I was told by a mechanic friend that it has to do with the crank position sensor.
I was told by a mechanic friend that it has to do with the crank position sensor.
I was concerned about having a long "start time" too, until I parked next to a nearly-new 100 series LC and heard it start.
It turned over about the same number of times as mine before firing up.
Yep, the LC startup delay must be by design.
It turned over about the same number of times as mine before firing up.
Yep, the LC startup delay must be by design.
How do you count the revolutions? Just by the audible beats and then we assume one beat is a revolution?
zcruiser
Needs monitoring
Yup, pretty much. Ever cranked a tractor engine by hand? Same "feeling".
2-3 at most for me, then like Grench said... "vrOOOOoooooooooooooooom"
2-3 at most for me, then like Grench said... "vrOOOOoooooooooooooooom"
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My '97 has always started quickly, seems like a fraction of a second. Can't even guess if it's even one crank before it vrooms to life. My heep on the other hand has always taken a few cranks before it catches.
Be interesting to see the state of your battery, battery cables, spark plugs/leads, fuel pump etc...
It's also never had a fast idle startup problem.
cheers,
george.
Be interesting to see the state of your battery, battery cables, spark plugs/leads, fuel pump etc...
It's also never had a fast idle startup problem.
cheers,
george.
Correct me if I don't understand your average in line six ...........but I would say that every one of your rigs are starting (much the same as mine) in about .5 (1/2) of a revolution or about the time the first or second freshly primed piston hits its combustion stroke (the third thump)
Six thumps per rev.
A fresh battery makes for a faster rev.
I have no idea what the starter/ring gear ratio is for an 80 but I would guess its spining at less than 40 RPM. Thats a long way from its idle at 650 RPM.
Thats my take.
Six thumps per rev.
A fresh battery makes for a faster rev.
I have no idea what the starter/ring gear ratio is for an 80 but I would guess its spining at less than 40 RPM. Thats a long way from its idle at 650 RPM.
Thats my take.
This is a documented feature. If you go to page IG-1 in the FSM it says that if you want to test the spark, but avoid injecting fuel, crank for only 1-2 seconds. This implies to me that the ecu does not permit energizing the injectors for a few seconds. My 80 can turn over a little more than once per second, so it makes sense that it takes about 3-5 spins to start. This might be to get oil pressure up before starting, I don't know.
Karl
Karl
Just for fun, I'll add that the 1HDT starts basically the instant the key is turned, except in really cold weather.
Mine 1HZ (+ aftermarket turbo) starts after 1/2 turn. Sorry, folks, but argument about oil pressure building IMHO ridiculous - starter proper engine at the best at 50 rpm far too little for oil pump. Plus if it would really required it would be implemented in diesel engines first because they far more sensitive to luck of lubrication. Even if it been done by design it should be another explanation.
