Car not revving past 4k

dliverance · 04-07-2012, 04:19 PM

Here's the rundown, last night I was driving my car under normal conditions (slow but entering boost every now and then) and the car started acting strange. It wouldn't rev past 4k and when it got close to 4k the tach went crazy and it started popping and losing power.

The first thing that came to mind was spark plugs but after thinking on it for a while I think it could also be the CAS, coil pack or maybe the ECU.

Background on the car...It's a 99 with a diypnp, 8psi, 7mge 305cc injectors, ngk cold plugs gapped at 40(I know this is stupid and will be re-gapping them to 30 soon), 93 octane always, walbro 190, new plug wires and a fairly conservative tune.

Just looking for a few opinions before I start changing out crap that doesn't need to be changed.

2ndGearRubber · 04-07-2012, 07:54 PM

I would guess spark issues. 99s were know for coil pack issues.

mini_FD · 04-08-2012, 07:12 AM

But coilpacks cause a misfire. A crank angle sensor wouldst even allow the car to start. Ecu maybe and definetly the spark plugs. Regap those

dliverance · 04-08-2012, 10:18 AM

I was talking about my came sensor.

mini_FD · 04-08-2012, 10:21 AM

I might have a spare

dliverance · 04-08-2012, 10:26 AM

Once I get off my ass here I'm going to go get some spark plugs. That's if the parts store is open on Easter Sunday.

BobMunob · 04-09-2012, 08:20 PM

Doubt its plugs. Sounds like a sensor sending a false signal. I'm gunna say cam sensor.

carlosvasquez · 04-09-2012, 08:26 PM

Your CAS connecting clip might have a breaking cable. 4 little cables comming off the clip I think (for NAs at least) happened to me. Got to the point where the ground wire comming off the clip broke completely along with mother one and caused my car not only crank and not start. Worth a check.

Doppelganger · 04-10-2012, 08:20 AM

I had plugs go bad and sound just like that.
.040" gap is huge for stock coils.

dliverance · 04-10-2012, 09:11 AM

I got new plugs but I won't have time to install them until Thursday.

HELLIONMX5 · 04-10-2012, 10:00 AM

check your tps. I had a problem similar to yours years ago.

dliverance · 04-14-2012, 03:05 PM

This bolt was loose lol. It holds the ground for the cam sensor.

batou · 04-14-2012, 03:14 PM

that's crazy. one little ground can mess with your whole... week? =\

Glad you fixed it!

dliverance · 04-14-2012, 03:21 PM

Yeah I got some Toyota cops to eliminate the coil pack and when I was checking my harness to see if it was the same I came across the loose bolt. At first it didn't register but when I saw the three black wires going to it I immediately assumed one was for the cam sensor. Needless to say I felt like an idiot.

clos561 · 04-14-2012, 03:49 PM

put some red loctite on dat bi

BobMunob · 04-15-2012, 12:03 PM

Told ya it was sensor related! And red loctight is bad! Blue is he way to go if you vr wanna take it loose again.

Hyper · 05-04-2012, 11:07 PM

Quote:

Originally Posted by batou

that's crazy. one little ground can mess with your whole... week? =\

Glad you fixed it!

Great post, I am going to check the CAS ground on my car cause I am getting ECU codes on the same thing.

04-07-2012, 04:19 PM	#1 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Car not revving past 4k Here's the rundown, last night I was driving my car under normal conditions (slow but entering boost every now and then) and the car started acting strange. It wouldn't rev past 4k and when it got close to 4k the tach went crazy and it started popping and losing power. The first thing that came to mind was spark plugs but after thinking on it for a while I think it could also be the CAS, coil pack or maybe the ECU. Background on the car...It's a 99 with a diypnp, 8psi, 7mge 305cc injectors, ngk cold plugs gapped at 40(I know this is stupid and will be re-gapping them to 30 soon), 93 octane always, walbro 190, new plug wires and a fairly conservative tune. Just looking for a few opinions before I start changing out crap that doesn't need to be changed.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-07-2012, 07:54 PM	#2 (permalink)
2ndGearRubber Member Join Date: May 2010 Location: Pittsburgh, PA Posts: 623	Re: Car not revving past 4k I would guess spark issues. 99s were know for coil pack issues.
	__________________ Current: 94 R Package / Former: 99 Silver PEP -Scott

04-08-2012, 07:12 AM	#3 (permalink)
mini_FD Supporting Member Join Date: Mar 2010 Location: Melbourne Beach Posts: 1,668	Re: Car not revving past 4k But coilpacks cause a misfire. A crank angle sensor wouldst even allow the car to start. Ecu maybe and definetly the spark plugs. Regap those
	__________________ My baby by rocketeerbandit, on Flickr MazdaSpeed/Garage Vary/Mishimoto/Autokonexion/AEM/ACT Stage3 6Puck/4.1torsen/Tein Flex/Racing Beat/Nardi 330mm/ Ryoku Rob/Fidanza/GarageStar/RS*R/JacksonRacingSwaybar

04-08-2012, 10:18 AM	#4 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Re: Car not revving past 4k I was talking about my came sensor.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-08-2012, 10:21 AM	#5 (permalink)
mini_FD Supporting Member Join Date: Mar 2010 Location: Melbourne Beach Posts: 1,668	Re: Car not revving past 4k I might have a spare
	__________________ My baby by rocketeerbandit, on Flickr MazdaSpeed/Garage Vary/Mishimoto/Autokonexion/AEM/ACT Stage3 6Puck/4.1torsen/Tein Flex/Racing Beat/Nardi 330mm/ Ryoku Rob/Fidanza/GarageStar/RS*R/JacksonRacingSwaybar

04-08-2012, 10:26 AM	#6 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Re: Car not revving past 4k Once I get off my ass here I'm going to go get some spark plugs. That's if the parts store is open on Easter Sunday.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-09-2012, 08:20 PM	#7 (permalink)
BobMunob Member Join Date: Aug 2007 Location: titsville, florida Posts: 675	Re: Car not revving past 4k Doubt its plugs. Sounds like a sensor sending a false signal. I'm gunna say cam sensor.

04-09-2012, 08:26 PM	#8 (permalink)
carlosvasquez Member Join Date: Oct 2011 Location: Boston, MA Posts: 731	Re: Car not revving past 4k Your CAS connecting clip might have a breaking cable. 4 little cables comming off the clip I think (for NAs at least) happened to me. Got to the point where the ground wire comming off the clip broke completely along with mother one and caused my car not only crank and not start. Worth a check.

04-10-2012, 08:20 AM	#9 (permalink)
Doppelganger Lit like a BranchDavidian Join Date: May 2006 Location: Atlanta Gee EH Posts: 4,529	Re: Car not revving past 4k I had plugs go bad and sound just like that. .040" gap is huge for stock coils.
	__________________ The car is on fire, and there is no driver at the wheel. 2002 Ti SE Turbo Cardomain MyAwesomeFlickr

04-10-2012, 09:11 AM	#10 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Re: Car not revving past 4k I got new plugs but I won't have time to install them until Thursday.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-10-2012, 10:00 AM	#11 (permalink)
HELLIONMX5 Member Join Date: Nov 2007 Location: NOLA Posts: 1,265	Re: Car not revving past 4k check your tps. I had a problem similar to yours years ago.
	__________________ www.mazda-speed.com Need stickers, any design, ideas, BIG small. Hit me up. coming out of lurker mode MSM #1153 out of 1428

04-14-2012, 03:05 PM	#12 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Re: Car not revving past 4k This bolt was loose lol. It holds the ground for the cam sensor.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-14-2012, 03:14 PM	#13 (permalink)
batou Hide yo kids hide yo wife Join Date: Sep 2007 Posts: 6,130	Re: Car not revving past 4k that's crazy. one little ground can mess with your whole... week? =\ Glad you fixed it!

04-14-2012, 03:21 PM	#14 (permalink)
dliverance I wanna go fast Join Date: Feb 2010 Location: Hollywood Fl Posts: 2,787	Re: Car not revving past 4k Yeah I got some Toyota cops to eliminate the coil pack and when I was checking my harness to see if it was the same I came across the loose bolt. At first it didn't register but when I saw the three black wires going to it I immediately assumed one was for the cam sensor. Needless to say I felt like an idiot.
	__________________ 1988 CRX Si- Daily, Autox whore 1993 RX7- Project,Garage queen

04-14-2012, 03:49 PM	#15 (permalink)
clos561 Member Join Date: Mar 2010 Location: Royal Palm Beach, Fl Posts: 297	Re: Car not revving past 4k put some red loctite on dat bi
	__________________ I own a 99 Miata

04-15-2012, 12:03 PM	#16 (permalink)
BobMunob Member Join Date: Aug 2007 Location: titsville, florida Posts: 675	Re: Car not revving past 4k Told ya it was sensor related! And red loctight is bad! Blue is he way to go if you vr wanna take it loose again.

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