Toyota D4D engine woes

**bongliza** · February 13th, 2006 02:48 PM

bro odell, wala pa kaming nabalitaan na 3.0L D4d, puro mga 2.5L lang.

**apexi_66** · February 13th, 2006 08:24 PM

Originally Posted by bongliza

bro odell, wala pa kaming nabalitaan na 3.0L D4d, puro mga 2.5L lang.

Si Larshell tanungin mo at may alam sya cases with 3.0L D4D at may post noon na tumirik sa gas station pagkatapos e park yong unit. Konti lang kasi 3.0L D4D unlike 2.5L D4D. Kailan pa kaya ma so solve ng Toyota itong D4D problems, solve ibig kong sabihin ay yong di pabalikbalik ang problems. Mahal din ang pa repair ng D4D pag wala na sa warranty saka kaya ka nga bumili ng bago para wala kang problems sa ride mo pero itong D4D ilan pa lang ang tinatakbo at may problems na lumalabas. Mali yata prediction nila na D4D problems starts at 12,000 Km - 100,000 Km as posted here before kasi iba mas earlier. Kasi naman, VVTi na lang kasi para worry free.

**altec** · February 14th, 2006 11:32 AM

As suggested by Jaeger, the following are my innova's fuel economy results. 55 liter tank capacity.

06/11/05 mileage start: 1586, 350km travelled, 36.03 liters 7.6km/liter
06/26/05 mileage 1987, 401 km, 47.31 liters, 8.47km/liter
06/30/05 mileage 2138, 151 km, 18.24 liters, 8.28km/liter
07/15/05 mileage 2550, 412 km, 47.52 liters, 8.28km/liter
07/26/05 mileage 2895 345 km, 45.84 liters, 7.53km/liter
08/09/05 mileage 3288 393 km, 47.95 liters, 8.2km/liter
08/24/05 mileage 3706 418 km, 49.5 liters, 8.44km/liter BIODIESEL 1ST LOAD BD1%

09/10/05 mileage 4108 402km, 40.0 liters 10.05km/liter
09/24/05 mileage 4514 406km 44.8 liters, 9.06km/liter CHOKING PROBLEM EXPERIENCED
10/10/05 mileage 4850 335km, 40 liters, 8.4km/liter
10/21/05 mileage 5252 398km, 42.4 liters, 9.48km/liter
10/29/05 mileage 5576 323km, 38.1 liters, 8.50km/liter
11/10/05 mileage 5938 362km, 44.7 liters, 8.09km/liter
11/22/05 mileage 6314 376km, 44.3 liters, 8.48km/liter

Estimate ko by this time, estrol in our overhead tank was used up, and shift to bioactiv

12/02/05 mileage 6714 399km, 43.5 liters, 9.19km/liter
12/12/05 mileage 7119 405km, 47.2 liters, 8.58km/liter

From this point on, lumipat ako ng bahay.

12/20/05 mileage 7540 420 km, 48.8liters, 8.62km/liter
1/02/06 mileage 7939 399km, 41.3 liters, 9.66km/liter
1/10/06 mileage 8326 387km, 40.0 liters 9.67km/liter
1/17/06 mileage 8796 470km, 48.4 liters, 9.67km/liter
1/24/06 mileage 9224 428km, 44.3 liters, 9.66km/liter
2/01/06 mileage 9662 438km, 46.5 liters, 9.41km/liter
2/08/06 mileage 10177 515km, 51 liters, 10.09km/liter

Take note that the choking problem went away after I had the filter removed, cleaned, and returned, and surprisingly, the choking problem went away. Never experienced it again. Was the only innova user who thought it was due to a loose fuel filter, but others experienced it and toyota diagnosed it to be a defective spring related to our poor diesel fuel. Jaeger and I theorize that it could be my pump's spring was about to give out, and when I started using BD, timing was perfect, because just on my 2nd BD load, the choking problem occured. But because of BD and its 32% lubricity increase effect, na corrected right away.

Just wanted to share our thoughts on this. Jaeger, ikaw naman mag comment. Those that had problems with the CRDI, did you use BD? If yes, how long before the problem cropped up?

**jaeger** · February 14th, 2006 02:06 PM

The following is my take on this matter:

There was a global initiative for countries to adopt a Clean Air policy which the oil companies also complied with by reducing the sulfur content in the diesel fuel they produced. In the desulfurization of diesel, the process also removed some other chemicals which provides lubricity in the fuel. This is the reason why the oil companies have to put lubricity additives to restore this essential property in diesel.

I think that the fuel supply pump of our 2.5-li. D4D is very maselan and requires a higher amount of lubricity in the fuel. If you check on the net, a great deal of the fuel pump failures are caused by lack of lubricity in diesel fuel used.

m2m and other members mentioned that the culprit in the D4Ds supply pump failure is the spring. So that spring must have already developed some form of peripheral corrosion, or scar marks due to the lack of lubricity.

At some point, those scars will be so deep causing some resistance in the spring action and later, that spring will just fail to do its job properly, causing the entire supply pump to eventually fail. Could this be the root cause of the D4D "choking" problem? Does this make sense to you?

So you may ask why other CRDI engines don't have this fuel supply pump problem? - their springs and pumps are just built tougher. Ours were built flimsier (thanks to Denso - f**k).

Originally Posted by garyq

When the sulfur content of our diesel was reduced the lubricity of the fuel was drastically affected. To increase the lubricity mfg had to put in additives. Sa mga studies posted sa biodiesel.org and some data I have a 32% increase in lubricity in B1 is not far-fetched coz sa scar marks on cylinder walls 50% ang reduction sa B1.

A 1% biodiesel blend will improve base-level diesel fuel lubricity by 32%. After an enlightening seminar on petroleum chemistry basics and bio-fuels last Sat. I personally believe that I should put in more lubricity in the diesel I feed into my Innova, just to help my rotten Denso pump do its job easier.

I temporarily stopped using BD on my D4D Innova from 6000~9000 odo. due to the words of caution posted on this thread, but I have resumed using BD now.

**falken** · February 16th, 2006 11:02 AM

May point si jaeger, my friend who's been using biodiesel on his Innova since Day 1 hasn't had any problems with his unit and it's odometer is nearing 15,000 kms.

**OTEP** · February 20th, 2006 12:34 AM

I was at Big Bert's last Saturday. May Innova D4d for washing. I asked the owner if he has had problems with the CRDi. Yes daw. Pinalitan yung fuel pump and some other components.

Pagtingin ko sa unit wala pang plaka! Ano ba naman yan...

**gregg_g** · February 20th, 2006 07:57 AM

yaiiks !!

**city** · February 20th, 2006 08:37 AM

is d4d same with CRDi interms of principle?....ano difference nung dalawa?

thanks

**jackaroo** · February 20th, 2006 08:45 AM

Originally Posted by falken

May point si jaeger, my friend who's been using biodiesel on his Innova since Day 1 hasn't had any problems with his unit and it's odometer is nearing 15,000 kms.

Can you pls ask your friend what brand of diesel fuel does he use? Petron, Shell or Caltex?

**m2m** · February 20th, 2006 10:20 AM

Originally Posted by OTEP

I was at Big Bert's last Saturday. May Innova D4d for washing. I asked the owner if he has had problems with the CRDi. Yes daw. Pinalitan yung fuel pump and some other components.

Pagtingin ko sa unit wala pang plaka! Ano ba naman yan...

That's not an addition to the stats. I think it was my unit you saw at BB last Saturday. I had it detailed (the Optiguard Paint protection) while its still fresh

Ikaw ba yung may dala ng Mazda 3?