My J hesitates to pull off fast

[nkawall]

hey guys...for the past couple a months my j has been struggling from 1000 to about 3000 rmp when warm...when its cold it pulls off fast and hardi cant stand it when its sluggish like this...could this be the egr valve?

[driverdriver]

Welcome to NICO.

(1.) See if the ECU is putting out a code. There are two ways to retrieve depending on the year of your car. They are "stuck" threads in this section that detail DIY instructions.(2.) Check your MAF (3.) Ohm test your injectors and ignition coils. They should be in the 10-14 ohm range. Anything below or above indiactes either a failed ignition coil or an injector.

[nkawall]

i dont think it could be an injector because i recently had all injectors replaced last may ...but i'll definitely try testing the ohms and the MAF...thanks

[driverdriver]

It could very well be an injector coil. They're relatively cheap and easy to replace. I think they're around $70 at Agincourt Infiniti-Nissan, the one around Sheppard and McCowan, not the Morningside auto mall store.

[nkawall]

oh ok great thats right nearby my house...thats where i got my fx35

[gr8scott72]

Sounds like a bad knock sensor. Mine did that. It retards the timing once the car warms up and unless I floored the gas the car felt like a slug.

[nkawall]

hmm that makes sense although when i floor it, it's still sluggish for about 3 - 5 seconds then it takes off

[gr8scott72]

hmm that makes sense although when i floor it, it's still sluggish for about 3 - 5 seconds then it takes off

I guess it takes the computer/engine that long to respond and change over from the normal maps to the WOT maps. I'm telling you though, mine did the same thing.

At least look into bypassing the knock sensor to tell if that is what is causing it. If it is and you don't want to run with it bypassed, you can relocate the sensor (Stock location is CRAZY hard to get to) and I can even sell you a new knock sensor and harness to do it.

[yodawill2000]

Yup Yup

I concur with the guy that got a killer j for a steal

You might also make sure your rad isnt clogged.Mine had a simular symptom and their was crud between the condenser and radiator about half way up !!The knock sensor was doing what it was supposed to !!I just took off the top rad mounts and tilted it back enough to get down in there and clean the kack out.Problemo' solved.

[nkawall]

Thanks for all the advice guys .. check out my car and tall me what you think

http://www.cardomain.com/ride/2106414

[yodawill2000]

Nice shine !!!

What wax are you using ?Also what year is that ?

[nkawall]

Zymol Liquid Waxand its a 1993It's only in this condition because my dad was the original owner

[ropace37]

try lucas gas treatment, mine was doing the same thing i thought it might be an injector going out....guess i just got some bad gas... i tried the lucas tune up in a bottle and filled the tank up. got to about a quarter of a tank and shes purrin again, i was skeptical at first but man i swear by that stuff now.....btw i thing its like 5-8 bucks may be worth a shot....

[nkawall]

alrighty then...i shall try that and get back 2 u guyz

[gotspeed]

im also going with the knock sensor, i had the same sluggish take offs i will bet anything its the KS

[nkawall]

i put in the lucas gas treatment and i have to admit...it made a difference but not much of a dfference...still sluggish at some times

[shortlid]

When was the last time the spark plugs were changed in the car? If nothing else change check the gap on them.

[nkawall]

last mayi changed them all

[RicoNyce]

hey every one i am also experiencing the same problem. Only mine seems a bit worse. Its sluggish the hole time im driving as if the dame thing doesn’t know im pushing the gas. Extremely boggy I will floor it and I don’t move then 5-10 sec later it moves slowly then bam, im off still slow I might add and this occurs the hole time im driving. I haven’t been able to drive my car for 6 months because of this. If you guys have any idea what will get my 1993 j30 back on the road I would greatly appreciate it further more I have taken it to 6 different places including infiniti to have it checked and every one gave me a different answer I have come to realize that none of them know what the hell there talking about so all of you are most likely my only hope. They stated it could be a bad coil over , bad MAF, O2 sensor or vehicle has no vacuum. (hemmmmm. All seem to be guesses.) I don’t know if this will help any of you but there is no check engine light or any other lights on for that matter and infiniti could not get a reading off there computer at all. but they all say my trany is fine.I look forward to all if any advice you may have. Thanks.

[yodawill2000]

First step is to see if the ECU is throwing a code.Some dont light the Check engine light , like the knock sensor.Have you cleaned the MAF lately?Thats an easy one to eliminate.

[RicoNyce]

First step is to see if the ECU is throwing a code.Some dont light the Check engine light , like the knock sensor.Have you cleaned the MAF lately?Thats an easy one to eliminate.

im a real newb when it comes to this i guest ill do a search on how to see how to check the ecu code. i have not cleaned the MAF ill try doing that. could it be a possibility the wires to the MAF are bad when i barley move the wire there I get some serious flocculation.

[yodawill2000]

BINGO !!!If you wiggle the MAF harness and hear the motor bog you need to clean the connectors and slap some dielectric grease on them.That may be your only problem !

[gr8scott72]

MAF is the first thing that came to my mind if it's a load related problem meaning that it is fine in idle but with a load (in gear) it has trouble.

[nkawall]

is the plug that you have to clean the contacts on the one with the clip on it and no screws ?

[Pogophil]

is the plug that you have to clean the contacts on the one with the clip on it and no screws ?

Yes, clean that plug with electrical cleaner, as well as the MAS air flow sensor in the intake tract.

You'll need to disconnect the MAS from the top of the airbox (4 bolts) and from the intake tract (1 screw). Spray electrical cleaner on the wire protruding into the middle of the air tract within the MAS.

[Pogophil]

MAF is the first thing that came to my mind if it's a load related problem meaning that it is fine in idle but with a load (in gear) it has trouble.

Scott, I'm interested in your train of thought -- why was the MAS the first thing that came to mind in this case??

[gr8scott72]

Scott, I'm interested in your train of thought -- why was the MAS the first thing that came to mind in this case??

because it was a load-based problem

[Pogophil]

because it was a load-based problem

Yes, and why does a load-based problem imply the MAS?

[yodawill2000]

i would think at idle the MAF wouldnt cause much of an issue but on throttle up if the MAF isnt telling the ecu to increase the fuel flow to the injectors you would have a power loss issue.

[Pogophil]

i would think at idle the MAF wouldnt cause much of an issue but on throttle up if the MAF isnt telling the ecu to increase the fuel flow to the injectors you would have a power loss issue.

Agreed, that's what I would think. This would be the case regardless of the load.

Maybe I'm missing something....