My Denso Plugs packed in!
Discussion
About 5 months ago I read interesting facts about Denso Iridium plugs so I tried them on my carb turbo.
Just before christmas we had a flood in the kitchen via the bathroom from the drain outside. I had to disconnect the drain pipe which poured water onto my Esprit. I started it onchristmas Eve but is was only running on 2/3 cylinders. it hasn't worked since.
I tried quite a few things, the dizzy cap was cracked I think but I brake it anywat trying to remove it. I changed this today together with the rotor arm but still it wouldn't work.
I had tried an old plug from my Nissan to see if I could get a spark and I did, however it was pretty weak. I then decided to pull out one of the densos and try that for a spark, nothing!
In the end I managed to locate some original NGK's and put them in. As soon as I tried to start the car, it fired up immediately!
All 4 plugs had gone. I don't know whether because my car is a carb turbo and not a fuel injected with an ECU to adjust the timing. The plugs were pretty fowled up and Iam wondering if the densos only work in perfect or near perfect condition.
I won't be using these again, that's for sure. I have to admit that at first I raved on about them but Iam the first to hold my hand up and say I was wrong.
I will stick with the NGK's and they are a grade higher, 7's instead of 6's.
Now with the new dizzy cap and rotor arm and plugs, my car starts like it's never started before. Much easier now.
Happy New Year from and very happy,
Dave Walters
Just before christmas we had a flood in the kitchen via the bathroom from the drain outside. I had to disconnect the drain pipe which poured water onto my Esprit. I started it onchristmas Eve but is was only running on 2/3 cylinders. it hasn't worked since.
I tried quite a few things, the dizzy cap was cracked I think but I brake it anywat trying to remove it. I changed this today together with the rotor arm but still it wouldn't work.
I had tried an old plug from my Nissan to see if I could get a spark and I did, however it was pretty weak. I then decided to pull out one of the densos and try that for a spark, nothing!
In the end I managed to locate some original NGK's and put them in. As soon as I tried to start the car, it fired up immediately!
All 4 plugs had gone. I don't know whether because my car is a carb turbo and not a fuel injected with an ECU to adjust the timing. The plugs were pretty fowled up and Iam wondering if the densos only work in perfect or near perfect condition.
I won't be using these again, that's for sure. I have to admit that at first I raved on about them but Iam the first to hold my hand up and say I was wrong.
I will stick with the NGK's and they are a grade higher, 7's instead of 6's.
Now with the new dizzy cap and rotor arm and plugs, my car starts like it's never started before. Much easier now.
Happy New Year from and very happy,
Dave Walters
I have Irridiums in both my turbo Esprit and a turbocharged Pontiac Fiero. The front plugs in the Fiero (parked outside) always have water leaking down on them from the gap between the front of the engine deck lid and the rear window. They are literally under water everytime it rains! Have never had a problem.
Perhaps your problem is elsewhere?
Perhaps your problem is elsewhere?
That explains a few things. Mine doesn't have an ECU. Iam wondering if my car was running rich and the plugs either got fowled up or oily, that they don't like it. I have also heard that though Densos are excellent in Japanese cars, some other makes don't like them.
I may try the NGK's after the standard ones I've put in need replacing.
Thanks for responding so quick.
Cheers,
Dave
I may try the NGK's after the standard ones I've put in need replacing.
Thanks for responding so quick.
Cheers,
Dave
Apparently you don't adjust an Iridium plug. They were a higer temperature range. The direct equivalent for a Denso Iridium is IW22 but I went to IW24. Do you think this is why it fowled up? Could it have been because mine is a carb turbo? I ran a higher grade plug to reduce detonation as Iam running higher boost but don't have a chargecooler. NOw I have put in standard plugs but Iam using a 7 grade instead of 6 grade.
Will keep you updated,
Cheers,
Dave
Will keep you updated,
Cheers,
Dave
OK, I think that is why you fouled out:
www.corollaperformance.com/TechInfo/ND-Info.html
lists data on NipponDenso plugs. The 24 is one heat range colder than the 22. One generally wants to run the coldest plug that will not foul, but I would guess you should stick with the stock 22 heat range as you fouled out a 24 (1 range colder). You could also be running too rich, which will foul a plug. With a carb turbo setup, you walk a fine line between just right and oops (boom). If everything else is OK, I would just change the heat range back to stock or even 1 hotter and leave it there.
One thing you might want to try is a MSD 6A ignition. Those things are great. I put one on my 4AGE 20 valve and it cured a real nasty miss I was having.
Dr.Hess
www.corollaperformance.com/TechInfo/ND-Info.html
lists data on NipponDenso plugs. The 24 is one heat range colder than the 22. One generally wants to run the coldest plug that will not foul, but I would guess you should stick with the stock 22 heat range as you fouled out a 24 (1 range colder). You could also be running too rich, which will foul a plug. With a carb turbo setup, you walk a fine line between just right and oops (boom). If everything else is OK, I would just change the heat range back to stock or even 1 hotter and leave it there.
One thing you might want to try is a MSD 6A ignition. Those things are great. I put one on my 4AGE 20 valve and it cured a real nasty miss I was having.
Dr.Hess
Come to think of it, the week before, my carb had been adjusted to make it richer. You don't suppose it would fowl up that quickly do you? It was working fine upto then.
I hadn't noticed any difference in smoke colour from the exhaust pipe.
I will get my local garage to have a look soon and set the mixture right, under load.
I went for a cooler plug because I wanted to reduce detonation. Iam looking into water injection soon.
Thanks,
Dave
I hadn't noticed any difference in smoke colour from the exhaust pipe.
I will get my local garage to have a look soon and set the mixture right, under load.
I went for a cooler plug because I wanted to reduce detonation. Iam looking into water injection soon.
Thanks,
Dave
Yeah, that would foul the plugs easily and quickly. I think you are going to need some actual dyno time to get it tuned right. Going with a hotter plug and more fuel (richer) may be better for you than less fuel and a leaner mixture. Motors make more HP the leaner they get, down to the ideal mixture then they go boom. If you are messing around with boost and mixtures, you are going to have to put it on a dyno with a wide band sensor and do it right.
You could just dump the carbies and go Megasquirt.
Dr.Hess
You could just dump the carbies and go Megasquirt.
Dr.Hess
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