acelleration problem? - Page 3 - ZR-1 Net Registry Forums

Harold Broerman · 09-18-2007

hi all, Harold again, we pulled the plenum off to check for vacuum leaks and found none, dont have a tech 1 tool ,so im kind of lost. is there a way to check the vacuum solenoid or am i looking in the wrong place?to refresh your memory, i have a code 61, and have replaced both fuel pumps and socks and both o2 sensors ,checked all vacuum lines outside and under the plenum. nothing has helped. HELP!!! HAROLD

09-18-2007

You can stumble through without a tech 1, but you will need a scan tool... and I'm not talking about just a code reader. You need to see sensor outputs.

The results of the dig tree are either faulty connection/faulty ecm/faulty solenoid/faulty actuator or hose.

jonszr1 · 09-20-2007

just an Idea did you ck each of the actuators to see if they are opening the secondary throttle blades and individually holding vaccume?

tomtom72 · 09-20-2007

Harold,

I just went thru this DTC 61 on my 90. I didn't have the correct software for my scan tool which meant that I could not do the "Feild Tests" required by the diagnostic flow chart in the FSM.

It comes down to the situation that you are reasonable sure that the vacuum connections and all the vacuum equipment works, holds vacuum? If yes then the fault or source of the 61 is electrical. Therefore the only three possible electrical items are:

2* control solenoid, can hold vacuum but not open on command from ECM. Coil part is fried or something?

ECM, I think all it does is ground the solenoid??? so it opens.

MAP sensor t-ed off of the left actuator. That MAP is under the ECM brkt. This is not included in the flow chart so I doubt it has an effect on 61. I think in theory this MAP is the only way the ECM gets to "see" what the vacuum in the 2* system is because I think the solenoid is only a two wire connection. Therefore there is no reference signal back to ECM.

Wiring. Outside shot is wiring preventing any communication among the solenoid & ECM. I would think you could see damaged wire but who knows.

What I did because of lack of the proper software was to r&r the 2* solenoid and reassemble. DTC 61 re-set, so I knew it was the ECM in my case as I could not find anything else while I was under the plenum using a test light and my Mark1 eyeball.

Do you have a spare good 2* solenoid? ECM? I have spare solenoids, but used my last ECM on my repair.

E-bay sometimes has Tech1 & Tech1A's listed but the trick is to get the right software. They have a web site, Vertronix.

Tom

Harold Broerman · 09-21-2007

hi all, i believe we have ruled out everything but the ecm. who has the best deal on replacement ecm,thank, Harold

tccrab · 09-21-2007

For a remaned unit (with a warranty) check with your local Chevy dealer.
I bought one last year for $134 plus overnight shipping charges.
I've got the part number here somwhere.....

tccrab · 09-21-2007

GM part #: 16196394

tccrab · 09-21-2007

Kurt's got a few NOS still on the shelf if you're a NCRS kind of guy, but be prepared to spend an arm and a leg and you'll probably have to toss in your first born as well to seal the deal.

Harold Broerman · 09-22-2007

Who is Kurt, and how bad is he going to hurt me?Harold

tccrab · 09-22-2007

Kurt White of White Racing Products.
http://www.whiteracingproducts.com/home

He is "Miura Parts" on eBay.

Figure on spending $450 or so.

09-18-2007	#21
Harold Broerman Join Date: Jan 2007 Location: lancaster,ca. Posts: 18	Re: acelleration problem? hi all, Harold again, we pulled the plenum off to check for vacuum leaks and found none, dont have a tech 1 tool ,so im kind of lost. is there a way to check the vacuum solenoid or am i looking in the wrong place?to refresh your memory, i have a code 61, and have replaced both fuel pumps and socks and both o2 sensors ,checked all vacuum lines outside and under the plenum. nothing has helped. HELP!!! HAROLD

09-18-2007	#22
Jeffvette Guest Posts: n/a	Re: acelleration problem? You can stumble through without a tech 1, but you will need a scan tool... and I'm not talking about just a code reader. You need to see sensor outputs. The results of the dig tree are either faulty connection/faulty ecm/faulty solenoid/faulty actuator or hose.

09-20-2007	#23
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: acelleration problem? just an Idea did you ck each of the actuators to see if they are opening the secondary throttle blades and individually holding vaccume?

09-20-2007	#24
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: acelleration problem? Harold, I just went thru this DTC 61 on my 90. I didn't have the correct software for my scan tool which meant that I could not do the "Feild Tests" required by the diagnostic flow chart in the FSM. It comes down to the situation that you are reasonable sure that the vacuum connections and all the vacuum equipment works, holds vacuum? If yes then the fault or source of the 61 is electrical. Therefore the only three possible electrical items are: 2* control solenoid, can hold vacuum but not open on command from ECM. Coil part is fried or something? ECM, I think all it does is ground the solenoid??? so it opens. MAP sensor t-ed off of the left actuator. That MAP is under the ECM brkt. This is not included in the flow chart so I doubt it has an effect on 61. I think in theory this MAP is the only way the ECM gets to "see" what the vacuum in the 2* system is because I think the solenoid is only a two wire connection. Therefore there is no reference signal back to ECM. Wiring. Outside shot is wiring preventing any communication among the solenoid & ECM. I would think you could see damaged wire but who knows. What I did because of lack of the proper software was to r&r the 2* solenoid and reassemble. DTC 61 re-set, so I knew it was the ECM in my case as I could not find anything else while I was under the plenum using a test light and my Mark1 eyeball. Do you have a spare good 2* solenoid? ECM? I have spare solenoids, but used my last ECM on my repair. E-bay sometimes has Tech1 & Tech1A's listed but the trick is to get the right software. They have a web site, Vertronix. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

09-21-2007	#25
Harold Broerman Join Date: Jan 2007 Location: lancaster,ca. Posts: 18	Re: acelleration problem? hi all, i believe we have ruled out everything but the ecm. who has the best deal on replacement ecm,thank, Harold

09-21-2007	#26
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,655	Re: acelleration problem? For a remaned unit (with a warranty) check with your local Chevy dealer. I bought one last year for $134 plus overnight shipping charges. I've got the part number here somwhere..... __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

09-21-2007	#27
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,655	Re: acelleration problem? GM part #: 16196394 __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

09-21-2007	#28
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,655	Re: acelleration problem? Kurt's got a few NOS still on the shelf if you're a NCRS kind of guy, but be prepared to spend an arm and a leg and you'll probably have to toss in your first born as well to seal the deal. __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

09-22-2007	#29
Harold Broerman Join Date: Jan 2007 Location: lancaster,ca. Posts: 18	Re: acelleration problem? Who is Kurt, and how bad is he going to hurt me?Harold

09-22-2007	#30
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,655	Re: acelleration problem? Kurt White of White Racing Products. http://www.whiteracingproducts.com/home He is "Miura Parts" on eBay. Figure on spending $450 or so. __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]