Intake PoppIng

[Liljay2003]

Yeah what the deal with my intake makeing a poppin sound at High Rpm< it seems to only do it when i floor it in 1st gear< And when it pops it lose power, It only does it at about 5000 to 6000 RPM in 1st gear> i cleaned the MAF and it still does it< What Happens when the IAT sensor goes bad> Could this be the Problem< Its nothing show up on the OBDII scanner so the engine light isnt on< it drives good for everyday driving but if i wanted to race somebody< they would pretty much hand it to me right now> So can anybody help

[GTP Dad]

The pop you hear is the engine hitting the rev limiter. It kills the igniton so that you can't damage the engine and when the rpm drops below the preset limit it runs well. Stay below the limiter and the popping should go away.

[Liljay2003]

i know what the rev limiter is< That happens when the car is in Park, But i'm talkin about while i'm driving and i just suddenly floor it and when it get hit in rpm it pops and boggs out< i have new sparks plug and i really havent checked the fuel filter but this problem doesnt effect everyday drving so i dont think the Fuel F is the problem<

[grandprix00]

try changing your blinker fluid.HAHHA jk maybe its the gas i know on gtp if u put in cheap gas too long the supercharger knocks kinda loud.? try that

[Liljay2003]

yeah i have a gt but i put 93 in there b/cuz i have a DHP PCM so i started that already< I clean the MAF but i didnt take it out, i think i'm going to try to take it out and clean it again as some as i get the tools to do it

[GTP Dad]

The rev limiter works at other times not just while in park. If you exceed the preset limit which is in the 5-6K range it will do the exact same thing as it does in park it will cause it to pop like you say it is doing.

[BNaylor]

Originally Posted by GTP Dad

The rev limiter works at other times not just while in park. If you exceed the preset limit which is in the 5-6K range it will do the exact same thing as it does in park it will cause it to pop like you say it is doing.

I agree with Lynn. It could be the rev/rpm limiter kicking in.

The rev or rpm limiter is made to kick in shortly after the maximum shift point which is 5800 rpms for a stock PCM or DHP PCM without Performance Shift mode.

In a DHP PCM, if Performance Shift is working and active then the maximum shift point is 6000 rpms.

In my experiences the tranny in full automatic mode (drive) will shift before the rev limiter sets in unless you are manually shifting which could cause the limiter to go active.

[Liljay2003]

Originally Posted by bnaylor

I agree with Lynn. It could be the rev/rpm limiter kicking in.

The rev or rpm limiter is made to kick in shortly after the maximum shift point which is 5800 rpms for a stock PCM or DHP PCM without Performance Shift mode.

In a DHP PCM, if Performance Shift is working and active then the maximum shift point is 6000 rpms.

In my experiences the tranny in full automatic mode (drive) will shift before the rev limiter sets in unless you are manually shifting which could cause the limiter to go active.

Well I have DHP PCM and P-Shift and i usually keep it off< But this Popping sound start at about 5000 RMP and pops and boggs intil its time for the car to Shift at about 5800 and is seems to only do it in 1st gear well as far as i can tell<I dont manually shift it at all> Could it be the IAT snesor< what happens when they go bad ( i thinking about replacing everything on the car it a 02 with 125000 miles it and i think it time for everything to be changed) What that Part Number or a IAT sensor

[BNaylor]

Originally Posted by Liljay2003

Well I have DHP PCM and P-Shift and i usually keep it off< But this Popping sound start at about 5000 RMP and pops and boggs intil its time for the car to Shift at about 5800 and is seems to only do it in 1st gear well as far as i can tell<I dont manually shift it at all> Could it be the IAT snesor< what happens when they go bad ( i thinking about replacing everything on the car it a 02 with 125000 miles it and i think it time for everything to be changed) What that Part Number or a IAT sensor

If you are getting a cutout or misfire way before 5800 - 6000 rpms at 5000 rpms then it sounds like you do have a problem.

The IAT doesn't cost much to change out. It can be ohmed out with a multimeter to see if it is within calibration just to be sure.

It sounds more like a MAF sensor or plugs/wires to me. What brand ignition wires or spark plugs. What is the plug heat range or number?

[Liljay2003]

Originally Posted by bnaylor

If you are getting a cutout or misfire way before 5800 - 6000 rpms at 5000 rpms then it sounds like you do have a problem.

The IAT doesn't cost much to change out. It can be ohmed out with a multimeter to see if it is within calibration just to be sure.

It sounds more like a MAF sensor or plugs/wires to me. What brand ignition wires or spark plugs. What is the plug heat range or number?

Well this Problem doesnt happen intil i floor it< so can it still be plugs> And i have the DHP so i put 93 gas in there MOST of the time< so could it be Reg Gas mess it up> And Does Auto Zone Sell IAT sensors and where can i get a Multimeter< and cant you put a resistor in there 4.7 ohms>

[BNaylor]

Originally Posted by Liljay2003

Well this Problem doesnt happen intil i floor it< so can it still be plugs> And i have the DHP so i put 93 gas in there MOST of the time< so could it be Reg Gas mess it up> And Does Auto Zone Sell IAT sensors and where can i get a Multimeter< and cant you put a resistor in there 4.7 ohms>

The spark plugs are always a possibility. When flaky they misfire at higher rpms like in a range of 4000 - 5800 rpms. All it takes is one bad one.

AZ should have the IAT - Wells Part Number SU176 $9.99. Cheaper than trying to get a multimeter. The resistor trick normally does not work.

The MAF sensor is still a possibility. Also, do you have the throttle body screen in or out?

[Liljay2003]

I got in and and top it out on the freeway just to see what it would do well i didnt top it out but i was just tryin to make it throw me a engine code and it did PO300 random/Multiple cylinder misfire dectected> I just read on another forum(camaro) and they replied to another dude it may be the ignition> Now i know i have a bad ignition switch and was going to fix that as some as the Part get here i order from GMPARTDIRECt< do anyone know how long it take i order it today> But anyway Could this be the problem in a Grand PRix< And it does it only at like 5000 to 5400 and it runs like it should after that intil it shift so from 5400 to about 5800 its back to normal.

[Liljay2003]

Where can i find a list or Part number< Would anyone say i need a new coil pack< i know that part is probaly expensive huh

[BNaylor]

Originally Posted by Liljay2003

Where can i find a list or Part number< Would anyone say i need a new coil pack< i know that part is probaly expensive huh

The coil packs and ignition control module (ICM) are a possbility. Coil packs run around $40. You can swap the coil packs around for troubleshooting purposes to determine of you really neeed one. The ICM can be tested at places like Autozone.

[Liljay2003]

problem solved, fuel filter< well i'm nothing going to say it sloved but it was clogged but i havent gotten to test it at high speeds today.