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Chris(aka-Moose)
Chris(aka-Moose), Nissan Technician
Category: Nissan
Satisfied Customers: 562
Experience:  16 years of experience
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Replaced all 8 coils and now in limp mode...no rever over

Customer Question

replaced all 8 coils and now in limp mode...no rever over 2500 but starts and idles fine.....im lost
JA: How many miles are on the car? What size is the engine?
Customer: 170k 5.6 v8 gas
JA: What year is your 2500?
Customer: 2004 2004
JA: Are you fixing your 2500 yourself? What have you tried so far?
Customer: new coils
JA: Anything else you want the mechanic to know before I connect you?
Customer: its a 2004 Nissan titan
Submitted: 4 months ago.
Category: Nissan
Expert:  Jay replied 4 months ago.

Hello my name is ***** ***** thank you for your question.

Did it rev and run fine before the coils? What codes do or did you have to make you replace the coils?

Let me know...

Customer: replied 4 months ago.
Ran fine had a #3 misfire...swapped with #1 and the miss followed the coil
Expert:  Jay replied 4 months ago.

Ok.. So what codes do you have now?

Customer: replied 4 months ago.
No codes now except po300... Blinking when holding pedal to floor
Expert:  Jay replied 4 months ago.

Did you change the spark plugs also?

Customer: replied 4 months ago.
No there about a year old... Iridium
Expert:  Jay replied 4 months ago.

What brand plugs? and where did you get the coils?

Customer: replied 4 months ago.
Ngk plugs Nissan coils
Customer: replied 4 months ago.
Starts fine but won't rever over 2200..ran better with 1 cyl misfire
Expert:  Jay replied 4 months ago.

Did you remove the intake duct?

Customer: replied 4 months ago.
No
Expert:  Jay replied 4 months ago.

does the truck idle smooth?

Customer: replied 4 months ago.
Smells like its flooded when giving throttle... In hooked mad at idle it it stalls out
Customer: replied 4 months ago.
In hooked maf and it shuts off
Expert:  Jay replied 4 months ago.

Normally the 2k rpms indicates a bad MAF sensor. If you start the truck with it unplugged, does it run better, the same? ( not driving it of course.. see if it does the same 2k rpms thing..

Customer: replied 4 months ago.
Starts... Runs worse... Cuts out at 1200...
Expert:  Jay replied 4 months ago.

If you put all the original coils back in, see if it returns to the normal operation before.. The reason I am asking you to do that is just in case the coils you got are after market and that they could be causing the issue.

Let me know

Customer: replied 4 months ago.
Coils are oem ... No aftermarket parts... Should I let it idle??? I'm afraid of cat damage
Expert:  Jay replied 4 months ago.

You brought the coils from the dealer?

Customer: replied 4 months ago.
Expert:  Jay replied 4 months ago.

I think there may be catt damage... That is the only thing I can think off with out using a scanner. At this point you are going to want to use a scanner to monitor the air and fuel mixture and monitor 02 sensor readings to try to verify that..

Customer: replied 4 months ago.
I was a Nissan arc mgr for 15 yrs.just no contacts any more
Expert:  Jay replied 4 months ago.

I hear ya.. I just though of one more trick I may have up my sleeve to see if there is a change.

Do you know about the Ecm relay in the IPDM? Do you recall that?

Customer: replied 4 months ago.
Switched it with the fog relay
Expert:  Jay replied 4 months ago.

Yea.. Give that a try and let me know what happens...

Customer: replied 4 months ago.
I already did
Expert:  Jay replied 4 months ago.

Then fuel pressure and a scanner is where we are at I am afraid.. Was hoping it was a simply swap of the relays...

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