Mekidbrat

94 Eldorado high idle/ no acceleration

Recommended Posts

I just brought a 94 Eldorado it idles at 2100rpm. I got the idle to clam down by pretty removing the iac. Now it idle at 1000ish rpm cleaned the throttle body with soapy water and a tooth brush it lowered the rpm little more . I took it for a drive around the block shift extremely hard in drive and reverse. Try to give it full throttle and it bogs around 1500rpm spits and sputters and popping noises out of the exhaust and if you hold the full throttle for 5 secs or so it feels like it going to die trying . There no codes on the computer.  

Edited by Mekidbrat

Share this post


Link to post
Share on other sites

Welcome.   :welcomesmiley:

Sounds like you are on the right path -- replace the IAC if it is not functioning; they are a maintenance item.  Hard shift can happen with high idle so will want to wait to diagnose.

Reference Thread: 

Reference Thread 2:

Reference Thread 3:

 


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

Follow me on: Twitter Instagram Youtube

Share this post


Link to post
Share on other sites
6 hours ago, Mekidbrat said:

I just brought a 94 Eldorado it idles at 2100rpm. I got the idle to clam down by pretty removing the iac. Now it idle at 1000ish rpm cleaned the throttle body with soapy water and a tooth brush it lowered the rpm little more . I took it for a drive around the block shift extremely hard in drive and reverse. Try to give it full throttle and it bogs around 1500rpm spits and sputters and popping noises out of the exhaust and if you hold the full throttle for 5 secs or so it feels like it going to die trying . There no codes on the computer.  

You don't have an IAC on a 94 Eldo.  You have an ISC, or Idle Speed Control.  I replaced one last year on a 95,  here is the thread there are good links in it also

 

 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Share this post


Link to post
Share on other sites

So I found out that the fuel rail pressure was a mere 15psi. So I just got the fuel pump I order and replace the fuel pump now it runs just find. But its stuck in 2nd gear. So I pulled the codes 

Which are as follow

No pcm data 

I022 HISTORY 

I032 CURRENT

I034 CURRENT

I052 HISTORY 

NO ACP CODES

NO SIR CODES 

NO TCS  DATA

S036 HISTORY 

S038 CURRENT 

S044 HISTORY 

S060 HISTORY 

S061 HISTORY 

S064 HISTORY 

S072 HISTORY 

S073 HISTORY 

S076 HISTORY 

S077 HISTORY 

My main concern at the I032 and I034 and how to fix those first any ideas would be nice the only thing I can come to is that I need to replace the pcm 

Share this post


Link to post
Share on other sites

It is probably bad shift solenoids.  I am not sure if you will get a code for them on obd1.  

Try disconnecting the battery to reboot the system and see if you still get this


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Share this post


Link to post
Share on other sites

Try removing and replacing the ECM plugs to reset them. The I034 indicates an ECM problem.  

With the engine idling do a 'tap test', tap on the ECM/PCM if the engine stumbles it indicates a bad pcm

Did you reinstall the ISC motor?

See this thread, if resetting the ECM connector doesnt work you may need to replace the ECM

 

 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.