Alright!, new car and first troubleshooting!!!! - ZR-1 Net Registry Forums

oricale · 06-12-2013

So I have the car and I want to get some opinions on a issue.

Key off Runs fine no issues....

Key on runs fine until I hammer it and she hesitates (all gears)

PO said he used to have a burned chip in it and now it's stock. Has a B&B exhaust and I think that's it.

The hesitation is not extreme where the car is falling apart its just stuttering from 3800 up.

GOLDCYLON · 06-12-2013

Quote:

Originally Posted by oricale

So I have the car and I want to get some opinions on a issue.

Key off Runs fine no issues....

Key on runs fine until I hammer it and she hesitates (all gears)

PO said he used to have a burned chip in it and now it's stock. Has a B&B exhaust and I think that's it.

The hesitation is not extreme where the car is falling apart its just stuttering from 3800 up.

Injectors would be my WAG, I would do a fuel pressure check as well maybe as simple as a fuel filter

ZZZZZR1 · 06-12-2013

Quote:

Originally Posted by GOLDCYLON

Injectors would be my WAG, I would do a fuel pressure check as well maybe as simple as a fuel filter

I agree. Typical 20yr old issues

Injectors. Coil packs. Spark plug wires. Spark plugs. Fuel pumps

David

oricale · 06-12-2013

Thank you for the responses!!.

The PO said he changed all the coils,wires and plugs. I actually have the stock ones he pulled out. HOWEVER.. I did not get secondary injectors!.

No lights light up, it just feels as though it push bad gas .

also: Opinions please

I am debating replacing the stereo in the car...With the history and provenance that this car goes with should I stay stock or install???

finally:

I asked a few other poeple....My throttle body has a STAMP OF AN RP # AND A SERIAL # on it.

Any ideas??

GOLDCYLON · 06-12-2013

Quote:

Originally Posted by oricale

Thank you for the responses!!.

The PO said he changed all the coils,wires and plugs. I actually have the stock ones he pulled out. HOWEVER.. I did not get secondary injectors!.

No lights light up, it just feels as though it push bad gas .

also: Opinions please

I am debating replacing the stereo in the car...With the history and provenance that this car goes with should I stay stock or install???

finally:

I asked a few other poeple....My throttle body has a STAMP OF AN RP # AND A SERIAL # on it.

Any ideas??

Yep the secondary injectors.... The fact that you mentioned no SES light No codes, fine at startup however struggles all the way through the power band with key on is a dead give away.

I suggest replacing the Radio unless your considering NCRS.

Take a pic of that stamp and general location

Coupe89 · 06-12-2013

Are you getting a SES light when passed the 3K RPM mark?
If so, you may have a a vacuum leek in the secondary system.

scottfab · 06-12-2013

Good job of listing the symptoms.
Just based on those I'd say you have one of the two secondary actuators sticking a bit. Common if you don't exercise at WOT much.
One way to isolate is to do many WOTs in a row. If the stumble does not repeat every time after that then that's it.

On the other hand if you go WOT and hold it for >10sec and you feel the torque flatten out then it's your secondary vacuum pump or a leak. That is you begin the WOT and all is strong up past 5000rmp then after a bit you feel the power drop off.

Schrade · 06-12-2013

Check H History DTC...

Air filter? K&N? Too much oil???

Did your wife see exhaust color with hammer down?

Put a compression guage on it and check the squeeze? (static compression too / leakdown time)

SteelBlueZR1 · 06-12-2013

Don't forget to check the MAP hose and replace it with new oem unit from Jerry's if it is not original hard line that won't collapse at high rpm... Also check secondary operation with plenum on using the procedure here: http://www.zr1specialist.com/HAT%20W...0Operation.pdf
Finally, don't discount the secondary selonoid switch failing as the cause. My car had similar symptoms and a new selonoid solved the issue... Good luck with your new Z!

Blue Flame Restorations · 06-12-2013

Sounds like since you have an early car that "may" have been used for evaluation PEP, I'd probably leave the secondaries intact and leave the car stock, especially since you already have a nice Z to flog.

Eric can probably help you on the stamped codes on your TB.

Again, congrats on the nice find!

06-12-2013	#1
oricale Join Date: Oct 2011 Location: STAFFORD VA, Posts: 576	Alright!, new car and first troubleshooting!!!! So I have the car and I want to get some opinions on a issue. Key off Runs fine no issues.... Key on runs fine until I hammer it and she hesitates (all gears) PO said he used to have a burned chip in it and now it's stock. Has a B&B exhaust and I think that's it. The hesitation is not extreme where the car is falling apart its just stuttering from 3800 up. __________________ [B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. Victory Loves Preparation

06-12-2013	#4
oricale Join Date: Oct 2011 Location: STAFFORD VA, Posts: 576	Re: Alright!, new car and first troubleshooting!!!! Thank you for the responses!!. The PO said he changed all the coils,wires and plugs. I actually have the stock ones he pulled out. HOWEVER.. I did not get secondary injectors!. No lights light up, it just feels as though it push bad gas . also: Opinions please I am debating replacing the stereo in the car...With the history and provenance that this car goes with should I stay stock or install??? finally: I asked a few other poeple....My throttle body has a STAMP OF AN RP # AND A SERIAL # on it. Any ideas?? __________________ [B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. Victory Loves Preparation

06-12-2013	#6
Coupe89 Join Date: Aug 2009 Location: Livermore, Ca Posts: 204	Re: Alright!, new car and first troubleshooting!!!! Are you getting a SES light when passed the 3K RPM mark? If so, you may have a a vacuum leek in the secondary system. __________________ 1990 ZR-1 #642

06-12-2013	#7
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Re: Alright!, new car and first troubleshooting!!!! Good job of listing the symptoms. Just based on those I'd say you have one of the two secondary actuators sticking a bit. Common if you don't exercise at WOT much. One way to isolate is to do many WOTs in a row. If the stumble does not repeat every time after that then that's it. On the other hand if you go WOT and hold it for >10sec and you feel the torque flatten out then it's your secondary vacuum pump or a leak. That is you begin the WOT and all is strong up past 5000rmp then after a bit you feel the power drop off. __________________ Scott Vett owner since 1979._It's about the car and the people

06-12-2013	#8
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Alright!, new car and first troubleshooting!!!! Check H History DTC... Air filter? K&N? Too much oil??? Did your wife see exhaust color with hammer down? Put a compression guage on it and check the squeeze? (static compression too / leakdown time) __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

06-12-2013	#9
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Re: Alright!, new car and first troubleshooting!!!! Don't forget to check the MAP hose and replace it with new oem unit from Jerry's if it is not original hard line that won't collapse at high rpm... Also check secondary operation with plenum on using the procedure here: http://www.zr1specialist.com/HAT%20W...0Operation.pdf Finally, don't discount the secondary selonoid switch failing as the cause. My car had similar symptoms and a new selonoid solved the issue... Good luck with your new Z! __________________ Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC]

06-12-2013	#10
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	Re: Alright!, new car and first troubleshooting!!!! Sounds like since you have an early car that "may" have been used for evaluation PEP, I'd probably leave the secondaries intact and leave the car stock, especially since you already have a nice Z to flog. Eric can probably help you on the stamped codes on your TB. Again, congrats on the nice find! __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project