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Engine running rough and hard to start
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TOPIC: Engine running rough and hard to start
#71867
Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
Hi Guys,

Third post and its a tech question.... I suspect I need a new coil but some reassurance would be helpful. Car is very hard to start. It does start and revs ok but driving under load it is hesitating and missing.... Turn it off and it wont start again.

Coil or anything else??

Mick
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#71873
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 327
Do you know how to check for error codes.

To quote another post on the site.

Tsporter wrote:
This is the diagnostic tool for an mr2!


_KUNENA_BBCODE_HIDEIMG

Try this and see if see puts out any error codes:

http://www.mr2oc.co.uk/know-your-2-knowledge-base/mr2-mk2.html?kbartid=162
slipsliderg
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#71879
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
Old tech love it

Engine light is not on so will this still work??
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#71883
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 327
Yep it will store any old codes until the EFI fuse is pulled or the battery disconnected for longer than 60 Sec.
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#71887
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
Sugar battery is now in the shed charging
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#71897
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 72
Check all your ignition contacts, the 2 clips going to the coil, clean the distributor also check to make sure the clips going into ecu in the boot are dry.
If any pins in the clips on ecu or ignition coil are wet use heatgun to dry them and maybe clean them up too, I had a similar problem, it was a bad connection somewhere
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#71909
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 313
Did you check your spark plugs? possibly they need replacing or gapping correctly?
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If you're suffering from lag, you're either in the wrong gear or the wrong car!

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#72167
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
I started by checking all the plugs and they look new, The HT leads also look newish with no cracks etc. and they fit snug onto the plugs so no concern there. Then I removed the Dizzy cap. Its ok if a little worn so Ill replace it anyway.

Then on to the coil..... This is not in good shape at all.... My money is definitely on the coli now as the problem.

Casing all burnt and cracked


_KUNENA_BBCODE_HIDEIMG


_KUNENA_BBCODE_HIDEIMG

Coil underneath all rusted and expanding



_KUNENA_BBCODE_HIDEIMG


Don't think Ill be wasting money replacing it..
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#72179
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 327
Never seen one like that before wonder what caused it, are the rain trays OK on the lid etc.

Perhaps when she is running with a new one you should check for any misfires or earth leaks.
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#72181
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
Rain trays??? These always seem to me to be exposed. Both the side pods and "bonnet" let a lot of water on air intake and fuse box/coil...
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#72185
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 327
Throw up a photo, I never had a problem with water getting into any of these item. Could the coil have over heated from earth leaks etc. That !at explain the damage to it.
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#72187
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 5
I dont think anything is missing I just think they are open on these cars..... but Ill check it all..... thanks man...
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#72193
Re: Engine running rough and hard to start 3 Years, 11 Months ago Karma: 313
Coil does not look great alright. While you are in there Another thing to check would be to see if your engine ground leads are in OK shape. The whole engine is a ground point for ignition - and some MR2 owners have found issues with injection due to broken ground cables.
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Last Edit: 2015/01/10 23:29 By Quandry.
If you're suffering from lag, you're either in the wrong gear or the wrong car!

How to post pics!
Click for mk2 BGB
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#72447
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 5
Ok so just a little update. New coil and dizzy fitted everything cleaned and tightened. Engine now runs sweet as a nut. Lots of power and no hesitation. All is well in that department.

Now that I've had a little drive in it the cooling system needs attention. It's not over heating which is good but I suspect the thermostat is stuck open. It runs stone cold on the move and temp guage goes to the middle when standing still. But even when the temp guage is in the middle the heater in the cabin is only Luke warm......

So I'm thinking new thermostat and a coolant flush. Anything else I should do???

Mick
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#72455
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 74
I'd same symptoms in mine last year and a new stat sorted it. 'Twas a hoor to bleed though, simple but slow process. I think it took me 4 times to get all the air out. Replaced the rad cap at the time too.
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#72457
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 5
Yea I reckon it'll sort it. Job for next Saturday
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#72459
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 313
Agree on all of the above. Also if you are handy with a multi meter, you can check your coolant temp sensor to see if it is showing the right resistance. Normally Toyota stuff is excellent and just lasts forever - having said that I did have to replace the coolant sensor on my own car, it just wore out.

Take a look at this page:
mr2.ie/mr2/bgb/mk2/mechanical/efi_system.html
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Last Edit: 2015/01/19 09:35 By Quandry.
If you're suffering from lag, you're either in the wrong gear or the wrong car!

How to post pics!
Click for mk2 BGB
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#72467
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 5
new stat ordered... only 23 quid from Toyota.....

Ill report back on the bleeding process... sounds like a pain.....
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#72489
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 327
Bleeding can be a pain, but if you follow the process slowly it will work.

I managed to do it right first time. It was such a surprise I was paranoid as feck for weeks afterwards that I had done it wrong
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#72493
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 313
Just a thought guys, years ago to clear the air pockets we used to (from cold) run the engine with the radiator cap off until it came up to temperature and then just put the cap back on. The idea is that the pump is circulating the coolant through the system and the air then finds its own way out to the highest point as it is pushed along - i.e. the open radiator cap. You could then just top up the coolant as the engine ran and warmed up until such a time as no more air pocket is shown.

Now that was on an old Celica which had a much smaller coolant system than the MR2 with the long runs up to the front end, however just wondering if anyone has tried that on a 2?
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Last Edit: 2015/01/20 17:19 By Quandry.
If you're suffering from lag, you're either in the wrong gear or the wrong car!

How to post pics!
Click for mk2 BGB
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#72495
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 30
Quandry wrote:
Just a thought guys, years ago to clear the air pockets we used to (from cold) run the engine with the radiator cap off until it came up to temperature and then just put the cap back on. The idea is that the pump is circulating the coolant through the system and the air then finds its own way out to the highest point as it is pushed along - i.e. the open radiator cap. You could then just top up the coolant as the engine ran and warmed up until such a time as no more air pocket is shown.

Now that was on an old Celica which had a much smaller coolant system than the MR2 with the long runs up to the front end, however just wondering if anyone has tried that on a 2?


That's pretty much what I did Quandry when I replaced the rads on mine last summer, I used this guide : http://www.mr2oc.co.uk/know-your-2-knowl...ase.html?kbartid=161

I was nervous as hell, like a Ready-Mix truck ... sh1ting bricks lol
But it's pretty detailed and step 30 is to run the car up to temperature with the rad cap only tightened half way ... to leave the air escape from the system
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#72497
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 5
That's a great article above. Thanks for all the tips guys. I've do e may Peugeots in the past this will be my first mr2

I'll report back when it's done
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#72523
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 4
I've just recently done this job using the guide at the link already mentioned. I "think" I've successfully bled the system and have run the engine up to temp a few times with no issues. I found the raising/lowering of the rear of the car (while the front was up on axle stands) helped to get lots of air out.
Whatever you do, don't (like me) have a look at the front bumper and say to yourself "I think I'll just whip this off and tidy up a few things". That's a VERY long story
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#72557
Re: Engine running rough and hard to start 3 Years, 10 Months ago Karma: 5
Wow bleeding this is taking forever..... Sloooooowwwwww

All seems good now. Except the cabin temp is t as hot as Id expect. But no more air coming out.

Fan cutting in and out for engine temp ok and temp staying up on the move.

Old thermostat was in a heap. All broken and wide open.

Anyway I'll give it a good lash later and see what's what.

Thanks mick
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#73605
Re: Engine running rough and hard to start 3 Years, 9 Months ago Karma: 5
So a bit late with the update here. After replacing the stat and bleeding the system all was well even on the track day in Mondello but no heat in the cabin

Only last weekend I was contemplating pulling out the dash to check the heater matrix. I removed the glovebox and started examining the heater controls that move the flaps etc about. Something didn't seem right so I disconnected everything and refitted it all again using clip marks to put everything back as it should. The hot/cold slider felt much smoother and guess what.... Heat baby...... Happy as a pig in poo

The flap that directs airflow to the heater matrix was stuck in the cold position so while the water valve was circulating water into the matrix no air was getting directed to it. Now everything works....

I've also replaced the roof locking guides so no more leaks.

Next is the rear left wheel bearing.

Loving this one
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#73633
Re: Engine running rough and hard to start 3 Years, 9 Months ago Karma: 25
Good work, the coolant system is a ballicks but worth doing right and checking regularly for a few weeks after just for peace of mind.

Wheel bearing is not hard to do if you have a press, usually getting the shaft out of the old hub is the hardest part. Consider just buying a second hand hub also, usually works out a bit cheaper than a new bearing and if the last one lasted 20 years do you really need another new one in there?
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