Help! Guttless and Wont Rev over 3k

[CarpenterRacing]

Hi Guys,
I am serious need of some help and pointers.
Got a 52 plate Terrano 3.0 SVE with 47k original miles on the clock. Nissan service stamped until we got it. Cat C however (got rear ended before we bought it and has had new fuel lines fitted and tank repaired although tanks slightly leaking atm)

Had it 6 months and alls been fine until now. Did a full service on it when we got it and not missed a beat. I towed my speedboat with her last week about 150 miles all fine, however the following day she became gutless!!!

Engine free revs when stationary and runs smoothly (slight smoke from the exhaust) however when you drive her she hits 2,000 rpm and struggles to reach 3,000 where she'll stay with your foot planted. She seems happier driving on 1/4 throttle than anymore.
I can kick her up to 80mph in 5th if I try but still no more than 3k RPM.
She has used a little water in 6 months (about a pint, maybe 2 from the rad) however coolant isn't contaminated and nor is the oil.
No management light on either!!!
It goes through its usual test when you first turn the ignition on but soon goes out.
Fuel system seems ok with a good hard primer plunger on the filter housing.
I've taken the MAF out and cleaned it to no avail.

Any ideas?

I have to tow our racecar to a charity car show in a months time and need her for that as my 2.7 is off the road SORN and MOTless. And to tow our 24 foot box trailer with any of our other motors isn't going to happen.

 

[Madmark]

Sounds like new maff needed or sticky egr valve

 

[Barrbeast]

Hmm I'd test the MAF by removing and seeing if there's any change - if she still runs the same then the MAF is probably goosed.

Cheap fixes first though - when were the filters last changed?

Other thing you can do is have a check on the Patrol4x4 and Nissanpatrol.au forums as the same 3.0 is used in the Trols. If you do go on there, try not to read about the historic 3.0 engine issues - provided your careful in what you do to it the 3.0 in the Terrano and later Trols is fine! :thumbs

Not sure if a stuck EGR valve would cause those issues or not? :nenau

 

[clivvy]

as above, classic MAF/EGR symptoms, easiest to check.

otherwise you're talking some sort of fuelling issue.

 

[panelbeater]

slight smoke says to me not enough fuel.do they have the dreaded mini filter in the ip inlet.
try to bypass all tank and lines by connecting a small fuel tank direct to ip input drive up the road and see what happens,but have enough fuel for return as some will go to tank.

 

[briggie]

MAF / mini filter :thumb2

 

[solarman216]

slight smoke says to me not enough fuel.do they have the dreaded mini filter in the ip inlet.

Mini ilter in all T2's (if they have it) is always in the return to the tank pipe, and maf as barrbeast says, Rick

 

[firebobby]

Mine was doing this, I fitted a good make fuel filter and she runs better than ever, defo change the fuel filter first, cheap and easy.

 

[Sweety]

My 2.7 wouldn't rev past 3K & kept getting MIL light on the dash changed the fuel filter & it fixed the problem:thumbs turned out my filter was partly blocked:doh might be worth a try as they don't cost much & it's a service part anyway

 

[CarpenterRacing]

Right guys,
I spent a couple of hours this morning looking at hoses for splits, etc.
Fuel filter was only changed 500 miles ago when I did a full service so am hedging away from a blocked filter atm (although may quickly return to that as its cheap to replace and I know the tank leaks so may be damaged and flaking inside!) The oil I'm surprised to say still resembles oil and not black sluggy mess like diesels usually do after a few miles which is positive to the overall condition of the engine.
Anyway, I decided to check the voltages on the terminals to the MAF as shown here -
http://www.nissanpatrol.com.au/forums/showthread.php?597-Checking-and-cleaning-MAF-sensors&

Terminals 4 read 14v (battery live) and 2 reads 5v as stated however terminal 1 reads 6v at idle and it says it should read 1.6-2.0v. Obviously worried I popped the MAF off and cleaned it out only to notice theres no resistor over the terminals like in this picture -

Do they all have this resistor? Should mine have this resistor? Obviously alarm bells rang when I saw it missing!
Also does this part number collate right with the engine - Bosch F 00C 2G2 061

Any advice will be greatly received!!!

 

[Barrbeast]

Easiest way to check it is simply to unplug the MAF and take her for a drive to see if there's any change in how she runs.

How are you cleaning the MAF by the way as all it should get is a wee squirt of electrical contact cleaner on the sensor wire, no physical contact.

 

[CarpenterRacing]

I'd unplugged it before after i first posted and the car died after 2 or 3 seconds at idle. When I restarted her she wouldn't rev properly so reconnected it.
Then the car drove almost properly for all of 100 metres or so then went gutless again. That's when I parked her up and left her till this morning to try.

Cleaned it with carb cleaner! You can't touch the wire as its deep inside the sensor.
Still thinking the missing diode/resistor has something to do with it as its strange the signal wire is reading 3 times the voltage it should be (according to the Aussie forums)

 

[jims-terrano]

Just a step back, was the car running ok before the filters were changed? If it was how long after did the poor running start?
Are you sure its not linked?

 

[firebobby]

As I said, just change the filter for known make, I fitted a blue print from ebay.Here's the number 400732903358

You may have pulled more crap through or the filter you fitted maybe braking down, it does happen.

 

[CarpenterRacing]

The filter is a Mann (used them for years in all our cars including customers in the V8's we do without even one failure) with only 500 miles on so cant believe its that.

Still hedging my bets on it being MAF

Found a Terrano Service Manual online here - http://diyservicemanuals.com/nissan/NissanTerranoR20.rar

Excerpt from EC-88:-
On Board Diagnosis Logic
An excessively high or low voltage from the sensor is sent to
ECM.
Check Items (Possible Cause)- Harness or connectors (The sensor circuit is open or shorted.)
Mass air flow sensor

Think I'll be ordering one this weekend and see

 

[firebobby]

The filter is a Mann (used them for years in all our cars including customers in the V8's we do without even one failure) with only 500 miles on so cant believe its that.

Still hedging my bets on it being MAF

Ah, OK then, Mann are are fine, just heard of some lesser filters failing, that's all/

 

[CarpenterRacing]

I appreciate the advice!
Just hate it when you don't get a management light on

 

[firebobby]

have you checked to see if the EML is working, some people have been known to remove them.

 

[rayf3262]

Right guys,
I spent a couple of hours this morning looking at hoses for splits, etc.
Fuel filter was only changed 500 miles ago when I did a full service so am hedging away from a blocked filter atm (although may quickly return to that as its cheap to replace and I know the tank leaks so may be damaged and flaking inside!) The oil I'm surprised to say still resembles oil and not black sluggy mess like diesels usually do after a few miles which is positive to the overall condition of the engine.
Anyway, I decided to check the voltages on the terminals to the MAF as shown here -
http://www.nissanpatrol.com.au/forums/showthread.php?597-Checking-and-cleaning-MAF-sensors&

Terminals 4 read 14v (battery live) and 2 reads 5v as stated however terminal 1 reads 6v at idle and it says it should read 1.6-2.0v. Obviously worried I popped the MAF off and cleaned it out only to notice theres no resistor over the terminals like in this picture -

Do they all have this resistor? Should mine have this resistor? Obviously alarm bells rang when I saw it missing!
Also does this part number collate right with the engine - Bosch F 00C 2G2 061

Any advice will be greatly received!!!

If your MAF output is ~6V then it is definitely unwell.
As said at idle should be ~1.8V rising to around 4V in excess of 3000 RPM.
The "resistor" is actually a diode and where fitted it is used to measure the inlet air temp. The Terrano does not use the IAT. Thats what the spare pin is for on the 5 pin connector.

 

[CarpenterRacing]

If your MAF output is ~6V then it is definitely unwell.
As said at idle should be ~1.8V rising to around 4V in excess of 3000 RPM.
The "resistor" is actually a diode and where fitted it is used to measure the inlet air temp. The Terrano does not use the IAT. Thats what the spare pin is for on the 5 pin connector.

Thanks for the advice.
I cleaned the MAF again to no avail. Noticed when I drive it from cold it now manages to get 300 metres before it went into sluggish again but that's it for the day until cold again.
Let the engine to get up to running temperature and checked the voltage from the MAF again and it still reads 6volts.
Changed the fuel filter but its done nothing (not too surprised but worth a punt!)
Glad it doesn't need the diode! Found out today its the same MAF as used in the Porsche Cayenne (numbers match) so no wonder its £150 for a new one.
Gonna have to bite the bullet and order one at this rate.

Have since noticed that it wont rev over 3500 revs at idle now.
Had foolishly assumed it would as it hits over 3000 so would let off to avoid redlining. (should have known better than to assume!!!!!!)