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Not Starting When Hot


lawlor2401
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Is there anyone out there who can help me.

Toyota Rav 4d4 2002

My rav will not start when hot. When my temperature guage gets up to half way it will not start, even when going to the garage and trying to jump start it. I have had so far, had it on the diagnostic machine and no faults found. I have had a crankshaft sensor fitted, and also a coolant temp sensor fitted. I stalled the car at the traffic lights the other night whilst hot stuck in the middle of the road myself and my daughter had to push it out of the way of the traffic and sit in it until temp guage had gone down (which was on a hot evening which took an hour) until it would start. Please can anyone give me some ideas as to what else it could be... The engine will turn but just will not fire.

Also failed to mention fitted a new fuel filter, had new turbo fitted as whilst I had bad starting when hot the turbo went.

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maybe a wild goose chase but it may be related to a crash/inertia switch which cuts fuel in case of impact, I have never come across a problem before relating to this but thats where I would start, not even sure what type is fitted, but maybe a bad connection or the temp is making it trigger, think it's on the bulkhead, If I get time I will try and look into it, but I have just given up working on motors, but always trying to help....

you need to make sure you have fuel pressure when starting hot and cold, good luck

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  • 3 months later...

Hi

Did you ever fix the problem?

I have had the same issue for over 12 months with my 2004 RAV4. I have had new SCV vales, new starter motor, new Battery and still the same. My local Toyota dealer does not know what is wrong and just keep on suggesting to try replacing different parts.

It is going back in next week as they now think it could be a relay on the EDU unit.... costs £900 !!!

I am pushing them to get this fixed FOC as i have spent enough already, on their advice....

Cheers Drew

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I had this problem on a Hyundai Trajet Diesel.

Someone at work mentioned the Battery voltage. One of the cells was down and I was only getting 11.8V.

I replaced the Battery and it has been OK since.

With all the electronics on cars nowadays they are really voltage sensitive.

Hope this helps

Adyb

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  • 3 years later...

Hi I have the same problem did you find out what the problem was ? 

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Have you had the timing belt done lately by any chance 

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i have but the problem was there before hand 

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Or ok it's just my dad's was just like that when he bought it it was also a bit noisy so I looked at the diesel pump timing some diesel's don't need the pumps timing up but these do and people have put belts on without doing this but if the belt was always fitted correctly and this can't be the case but his was exactly the same sorry I couldn't help but will you let me know what the fix is please 

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I had the same issue and replaced the Battery and starter motor with a 2.2KW unit a couple of months ago. This seemed to fix it but in the last few weeks I've noticed it's getting worse again, the car fires up perfectly from cold but when warm it's definitely a longer crank (but it starts and that's an improvement on before!)

So if you're happy with the problem being masked but making the car usable I'd change the motor. I don't think there is a known fix for this but if it gets worse I'll be considering injectors/fuel pump as likely candidates for the issue.

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Hi chaps I had a Rav 4 D4D  for 10 years and for the last 2 we had problems starting when hot, tried everything sensors Battery ect . then uprated the starter motor to a 2.2 kw which only just fits

it fixed our problem at a cost of about £120,[ did the work ourselves]  we  would have kept the Rav /  but in the meantime we had bought a Yeti, much younger,But had it for about a month  before selling it without a moments problem.    

Edited by BOB IN BED
spelling mistake
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  • 2 weeks later...

take a scientfic approach and look at the fuel trim data on startup to see what might be the problem and figure it out with data.

Guessing parts and starting sporadically will just cause you a headache as the part you replace may not be implicated in the problem you have.

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  • 10 months later...

Same problem, 2003 XT4 2L D4D, 140k. Starts fine when cold but won't start when engine up to temp. Need to leave it 10 - 15 mins to cool down before it will start.

Cheers Saul

 

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Cars which start fine when cold - fail to start when hot but start OK when left for a while often suffer from heat soak of the starter motor. Engine heat causes the starter motor to increase in temperature - this increases the resistance of the windings - the current load increases and the car becomes difficult to start. If the motor is left to cool for a while - the car starts fine. Proprietary heat covers are available but at least one forum member solved the problem by wrapping the body of the starter motor with exhaust heat wrap.

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  • 2 weeks later...

I had this problem. Start fine from cold but drive it for a while, turn it off and won't start until it cools down. Put a brand new starter on the car. And guess what. Exactly the same. Made no difference. It turns over as if the Battery is flat. Leave it until it's cold and it fires straight up. Doing my head in!

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I've posted few times on how I solved this - do a search, and if you have problems let me know and I'll find the post.

But I'd start by cleaning the earthing connections (both cables)

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+1 starter motor that starts carbon brush conductive dust inside windings to body, strip and blow out is cheapest solution or a service exchange from an auto electrical mob at 100 quid or so if it needs brushes

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  • 2 months later...
On 3/9/2020 at 7:33 PM, RAV4-D4D said:

I've posted few times on how I solved this - do a search, and if you have problems let me know and I'll find the post.

But I'd start by cleaning the earthing connections (both cables)

Hi tried everything but hot engine still won’t start please help

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Hi Cliffy

Can you please take a moment to describe what the car is doing when it won't start, what sort of noises does it make, what does the dashboard do?

Since you've quoted one of my earlier posts I assume you have given the earth cables a thorough clean, both ends and both cables (ie you've removed the air intake to access the second one)? Were you very thorough in the cleaning? I tried to take mine back to virtually bare metal and then put some Battery paste on them to stop corrosion.

If I was you I'd go back and clean the earth cables again, I had the hot start issue and it was really bad and I am convinced cleaning the cables was the main contributor to solving it. My car has been faultless for the last 12 months or so since I did it and it I would know if it was still there as it occurred on any journey over about 15mins.

 

If you're sure that hasn't worked one cheap/easy-ish thing is to wrap the starter motor. I used lava rock fabric (fiddly and needs careful fixing) but you can buy start motor covers - this did seem to help a bit but the issue deteriorated quickly a few weeks later. (This didn't make it worse as it;s still on the car now).

Alternatively, you could replace the starter motor with a 2.2kw unit, this was the second thing I did (first was to change the battery), and it masked the issue a but the car still wasn't fixed and deteriorated.

You could also change the fuel filter, but it really depends what noise your engine is making as to whether this is likely to help. I am assuming your engine sounds like it has a flat Battery when you try to charge so maybe a clicking sounds, or perhaps you turn the key other than lights on the dash you don't see much?

 

If you need more help just come back and ask, this is fixable!

 

 

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  • 2 months later...
On 5/31/2020 at 8:36 AM, RAV4-D4D said:

Hi Cliffy

Can you please take a moment to describe what the car is doing when it won't start, what sort of noises does it make, what does the dashboard do?

Since you've quoted one of my earlier posts I assume you have given the earth cables a thorough clean, both ends and both cables (ie you've removed the air intake to access the second one)? Were you very thorough in the cleaning? I tried to take mine back to virtually bare metal and then put some Battery paste on them to stop corrosion.

If I was you I'd go back and clean the earth cables again, I had the hot start issue and it was really bad and I am convinced cleaning the cables was the main contributor to solving it. My car has been faultless for the last 12 months or so since I did it and it I would know if it was still there as it occurred on any journey over about 15mins.

 

If you're sure that hasn't worked one cheap/easy-ish thing is to wrap the starter motor. I used lava rock fabric (fiddly and needs careful fixing) but you can buy start motor covers - this did seem to help a bit but the issue deteriorated quickly a few weeks later. (This didn't make it worse as it;s still on the car now).

Alternatively, you could replace the starter motor with a 2.2kw unit, this was the second thing I did (first was to change the Battery), and it masked the issue a but the car still wasn't fixed and deteriorated.

You could also change the fuel filter, but it really depends what noise your engine is making as to whether this is likely to help. I am assuming your engine sounds like it has a flat Battery when you try to charge so maybe a clicking sounds, or perhaps you turn the key other than lights on the dash you don't see much?

 

If you need more help just come back and ask, this is fixable!

 

 

Good morning hopefully I am doing this correctly. I bought a 2005 Rav 4 2ltr 4D4 3 weeks ago and basically was seen off. Have found the car will never restart immediately when up to normal running temperature which is a pain. Quickly realized after buying that the car seemed to lack low down power resulting in a couple of stalls followed by great difficulty restarting. I have replaced suction control valves and fuel filter ,cleaned EGR valve and MAF. Bottom end power just off idle now much better but hot start problem remains. Looking at lots of posts on this subject and many suggest starter motor heat sink problem my car seems to be turning over at a good speed both cold and hot so a starter motor issue doesn't seem likely. Any ideas at all would be very welcome as it's a real pain being afraid of stalling or even switching off the engine when fueling ECT .

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Andy ,we had the same issue on our Honda FRV 2.2 diesel ,160k miles ,started perfectly when cold but restarting when warm took ages, no fault code apart from occasional crank posn sensor .I would find a proper diesel specialist not a dealer who only go by fault codes ,we sold it in the end still not cured to an on line buy any car place .

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If you are sure that the starter is spinning the engine properly a couple of other suggestions. Does it make any difference whether you floor the throttle pedal or don't touch the throttle pedal? If you obtain some of the ether based cold start spray see what happens when you spray it into the air intake while an assistant cranks the engine over. If the engine fires it would confirm that you have a fueling issue which on a diesel is actually fairly certain unless the air intake or even the exhaust is blocked.

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On 8/26/2020 at 9:43 AM, roadster-rav said:

If you are sure that the starter is spinning the engine properly a couple of other suggestions. Does it make any difference whether you floor the throttle pedal or don't touch the throttle pedal? If you obtain some of the ether based cold start spray see what happens when you spray it into the air intake while an assistant cranks the engine over. If the engine fires it would confirm that you have a fueling issue which on a diesel is actually fairly certain unless the air intake or even the exhaust is blocked.

Hi thanks for your advice I changed the starter motor this weekend deep down I didn't think it would help as old one spinning engine ok but a lot of people seemed to be pointing to the starter. Reconditioned starter has made no difference will try the easy start experiment see what happens should have said throttle position makes no difference when trying to start when engine got

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  • 1 month later...
On 8/22/2020 at 10:36 AM, Andy Williams said:

Good morning hopefully I am doing this correctly. I bought a 2005 Rav 4 2ltr 4D4 3 weeks ago and basically was seen off. Have found the car will never restart immediately when up to normal running temperature which is a pain. Quickly realized after buying that the car seemed to lack low down power resulting in a couple of stalls followed by great difficulty restarting. I have replaced suction control valves and fuel filter ,cleaned EGR valve and MAF. Bottom end power just off idle now much better but hot start problem remains. Looking at lots of posts on this subject and many suggest starter motor heat sink problem my car seems to be turning over at a good speed both cold and hot so a starter motor issue doesn't seem likely. Any ideas at all would be very welcome as it's a real pain being afraid of stalling or even switching off the engine when fueling ECT .

 

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I've had this issue for ages. Changed the Battery and coolant temp sensor. A guy on here RAV4-D4D said clean the earth leads. so I cleaned the Battery earth lead both ends. Take them back to bare metal. Give the Battery negative terminal a little rub down. Rub down the area on the chassis that the lead bolts too, down to bare metal. reconnect and cover with something that will prevent it from corroding. Look for other earths that may be connected in the same area. remove the end and clean to bare metal and the chassis, reconnect. They may not be part of the problem but you're in the area so give them a clean. Bad earths cause heaps of problems and they're simple to rectify. We always go for changing bits when the simple inexpensive solution is under our noses. I hope this works for you, Seems to have worked for me. 

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  • 3 months later...

Mine( 2004 d4d) does this too. Starts fine cold, but when warm just turns over normal speed and doesn't fire. After about a minute of trying it'll start chugging , getting faster until it eventually starts. Can be embarrassing if you stall it.

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