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warm start issues on replacement engine
Car starts fine when cold.
When warm / hot will start after 10 - 20 turns on starter. After looking thru threads was looking to take sensors off old engine and replace onto this one. Have cleaned MAF & changed rear temp sensors and thought all was well - still there. The engine I'm using was from a 92 salvage and sat idle for 4 yrs I reckon. Am I on the right track with doing the other sensors or try something else - Car runs fine once it's running - but really feels like it needs to turn over more than it should before it gets running, and I know they normally pretty robust and start straight away - heading to post count 100! |
#2
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Re: warm start issues on replacement engine
I have had the same problem with mine. I have had many sensors replaced but it still has the same problem. Cold start no problem, warm start is a problem. I have found that one quick punch of the accelerator as it starts to crank seems to give it the ability to start when warm. More than one quick punch will flood the engine so be careful. Mine is a '92 but I don't know the year of the replacement engine. I have put almost 100,000 miles on the replacement engine and it has had the problem since day 1.
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'92 LSL TEAL 277,000 miles Trans (on # 3) Engine (on # 2) "NEW" VISORS '03 Forester XS 214,000 miles '05 Outback 3.0R |
#3
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Re: warm start issues on replacement engine
Sounds like you might have a heat soak issue with the starter (?)
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#4
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Re: warm start issues on replacement engine
Many starters, same problem.
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'92 LSL TEAL 277,000 miles Trans (on # 3) Engine (on # 2) "NEW" VISORS '03 Forester XS 214,000 miles '05 Outback 3.0R |
#5
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Re: warm start issues on replacement engine
Quote:
First fuel, if if has a leaking injector, or a faulty temp sensor, it can be too rich to start first off, has to be cleared out to go. The other one is the magnetic sensors like the crank,and cam position sensors. These age with time to lose some of the magnetic strength to produce a weak signal. It may be strong enough to start when cold, but when they heat up the curie effect causes them to lose more magnetic strength, so that the signal is too weak to produce a constant signal, takes more turning for the ECU to trigger the injectors and spark. Try swapping the ones out of the old engine, both cam and crank. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#6
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update
progress has been made - will post here so it may help others (frustrating doing the searches and most are dead ends)
Installed the 2 cam & 1 crank sensors + 2 knock sensors. Removed the alternator - then did it the hard way by leaving the plenum on to do the knock sensors. All good - problem fixed. Looking at the removed sensors I'd guess the knock sensors were playing up when hot, other sensors were just dirty. At least it was not the wire harness for the engine which I was dreading - it is quite hard and brittle. Now starts first go every go - just like the maker intended. Thanks for the inputs bruce |
#7
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Re: update
Quote:
Looks like your problem, good work. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#8
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Re: warm start issues on replacement engine
Hey I just changed the cam, cam and crank sensors, the car starts and drives so different now
Before: Cold start - fine Starting after immediately switching off - fine Come back 2 or more hours later to start - engine turned over and over and over My idle was low before, and now it's back up, my idle was at about 400rpm, at or below (in drive) the first line from 0 on the tachometer, the car vibrated because the idle was low, you could feel the fans kicking in and out and any rpm fluctuation SO ANNOYING!! Now it's good as gold, idles at the 1st line below 1000rpm I can take a picture of my old sensor if you like Jordan. |
#9
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Re: warm start issues on replacement engine
appears problem is still there.
Cold Start - instant ignition warm start - short stop - instant ignition warm start - 20min stop or longer - very hard to start - 20 / 30 cranks let car go cold - back to instant ignition. so the fact if it cools down then starts indicates there is obviously fuel could it be coils & H/T leads, weak earth somewhere when hot? has to be something specific to this engine as previous engine was a well behaved one! |
#10
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Re: warm start issues on replacement engine
Quote:
Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#11
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Re: warm start issues on replacement engine
maybe temp sensor ? i've had a subaru throw crank and cam sensor codes from cranking too long when it really was the fuel pump relay not working. So whats different on this motor to the old one? which sensors are from the old engine which are not? change all of them over does it still do it ?
cam |
#12
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Re: warm start issues on replacement engine
You never know, the crank sensors are very old.. from both engines.
When you drive the car for about 30mins+ come to stop with the car in drive, see what your idle revs are at... in drive. If the pointer is just at the first line above zero (don't quote me) but that indicates something isn't right. Has there been noticable changes since changing the vacuum lines? |
#13
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Re: warm start issues on replacement engine
will try changing the fuel rail and injectors, then H/T leads.
Getting no codes at all - car really runs great except for this warm start problems - even get the feeling the engine has stalled when at lights and you can't even tell it's running. BTW - when they list our injectors as dual injection - do they refer that it does entry thru each inlet Vv, 2 per cyl or it does a double pump or something.? |
#14
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Re: warm start issues on replacement engine
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When the trouble is apparent, put your thinking cap on. You have been given several tips on what to concentrate. Don't put yourself down as not having the required experience. Common sense is top of the order. Sorry I have not seen the injectors described as dual injection.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#15
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Re: warm start issues on replacement engine
Hey Bruce, hope you get this.
My SVX is also having warm start issues which I can't seem to find. After reseting the ECU, the problem seems gone but a couple of days later it comes back. It should be either gound wires, ignition switch or starter motor. I have had an ignition switch code a couple of months ago, reset it and it never came back. Very annoying problem!! especially after spending close to a $1000 in engine sensors. Jordan, |
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