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Discussion Starter · #1 · (Edited)
Hi everyone, first of all thanks for taking the time off to read my post.

here is the deal: i own a frontier d22 zd30ddt engine, crew cab.

this Saturday i had this problem: i was driving on highway doing some 90 mph at 3500-3600 rpm when the truck suddenly started bucking, the check engine light turned on and i pulled over to check oil and stuff like that, i thought maybe something went off and i spilled the oil or something worst. turns out there was no oil nowhere, then i thought it was a sensor thing so i checked all the sensors, unplugged and plugged them again. i turned the ignition key, all the lights were on then i started the engine, the light was off. i thought it was a faulty sensor or something, i hit the road again. shifting at 3200-3500rpm, 1rst gear was ok, 2nd gear was ok, 3rd gear when i reached 3k rpm there was the bucking, shifted to 4th gear at 3k the same, the vehicle was bucking again, at 5th gear when i got 3100 rpm there was the bucking again and the light :(!! pulled over again, and do over.

maybe its just me but i think the vehicle should behave better at 2k rpm but it doesnt i kind of feel it powerless, it just get better when i get to 2,5k rpm wich shouldnt be since ive seen the torque graphic and @2k rpm the vehicle should have maximun torque, so whats going on with me ?

iam actually running a frontier with a zd30ddt engine with blocked EGR, oil catch can, original turbo and 2.5" exhaust straight pipe from dump pipe.

PD: i checked the header for leaks, maybe the gasket was failing and i was losing pressure but no, no leaks.

iam kind of desperate, this week iam going to install a boost gauge to measure the turbo boost, anyone knows what the normal boost readings should be like ??

greetings, any help would be just fine.

if anyone knows how to read a CEL code with a scanner by making the CEL light blink id really appreciate it
 

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we cant help much if we dont know the year and the miles on it, any new mods in the last few days?... but personally, i think running the RPMs that high on a normal basis could potentially be killing the motor. the tranny may be giving or something else. my 06 is only at about 2600 RPMs at 90mph
 

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Check ALL grounds VERY well...
Reset ECM
Check plugs
check ignition coils
...
if nothing bad found...


Bad ECM if no code is stored in the memory to read...

that's my guess!



If the ECM is bad, betting on it being caused by a bad ground in the ignition system... that can cause serious damage to the computer's ignition circuit.
 

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how do you have an 05 that's a d22?

sounds like a trans problem. what year in the motor and ecu? is it OBD II? if it is just got to a local auto parts shop, they should read the code for free.
 

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Hi everyone, first of all thanks for taking the time off to read my post.

here is the deal: i own a frontier d22 zd30ddt engine, crew cab.
Repost your question in the Navara forum so other diesel owners will see it.
 

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Discussion Starter · #11 ·
well the vehicle is 2005, made in japan i guess since everything says made in japan, in venezuela they kept selling it till 2007, dont know where the ecu is, the engine is ZD30DDT, the CEL turns on only in 4th and 5th gear, now that ppl talked about the gearbox, what if i unplug the gearbox neutral position switch? and give it a try. what about the turbo? shouldnt the vehicle at 2k rpm have a good torque? i dont feel like it have such torque.

any other idea
havnt seen the trans fluid, ill try to change it tomorrow.

already posted it on the navara forum
 

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Discussion Starter · #14 ·
I've checked the gearbox, it has 5 switches, all of them in the passenger side, I unplugged the first 2 and it didn't fix the issue, I thought the 4th and 5th switches, counting them from front to rear were transfer switches, 4x4 select and stuff, and the middle switch, well this is kind of embarrassing but I couldn't unplugged it, its a weird switch. wich one is the neutral position switch ? Regards
 
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