LD28 engine idling high & not responding to throttle

Discuss (and cuss) the Nissan LD-series OHC Six diesel engine, popularly available in the US in 1981-83 Datsun/Nissan Maxima Sedans & Wagons.

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LD28 engine idling high & not responding to throttle


Post by brocky41 »

Hi guys

Im Brock from New Zealand, im new to the forum and new to diesels - but from what ive seen so far this place is a wealth of knowledge.

Ive got hopefully a quick question on an LD im trying to get going from a crashed car that has been sitting for around 10 Years.

Its a Non EGR LD28 with the cooler - it starts and runs rough at a high idle and has a knock sound every 10 seconds or so, roughly 1000-1200rpm (sounds a little like running on 5), then any movement on the throttle (part or full) there is no change at all on rpm.

I thought it might have been bad fuel etc so ran a line to a fuel container with a prime pump filter. now when you start it it does the same idle thing but the faster you prime the more it starts to rev up. (still rough though and alot of white smoke but dont know if thats just because its been sitting).

I thought maybe injectors or even the pump may be an issue - it was running ok after the crash aswell. Timing?? Im at a loss as to what to do now, i have 1 other engine that ran good just has the front sump and mine needs a rear sump (didnt want to make a pickup yet).

Any help much appreciated
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Re: LD28 engine idling high & not responding to throttle


Post by dieseldorf »

Something is stuck inside your IP after 10 years sitting there. Did you use clean fuel and filter for start-up?
I would suggest to run the engine for 2-3 hours until it reaches normal operating temperature and beyond. Add some ATF oil into the fuel. It is a good cleaner and lubricant at the same time. If that doesn't help the IP needs to be serviced.
Astro Van with LD28 propulsion
'84 Mercedes 190D 2.2L 5-Speed Manual purchased 06/12 SOLD 06/13
'86 Ford Escort Wagon Diesel MT Sold 07-17-08
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Re: LD28 engine idling high & not responding to throttle


Post by asavage »

The IP needs to be rebuilt.
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
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LD28 engine idling high not responding to throttle


Post by BarryLaX »

Hi, i bought an oil cooler from a Datsun 280zx but without the adapter to fit in the place of the stock fj one where the oil filter fits...

So i cant seem to find one, any ideas?

Or any other make , model fits?
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