Author Topic: Please help with my C4 before I go insane! (Read 28330 times)

glenco · « **on:** April 16, 2015, 06:54:56 PM »

Hi all I think this is my first post on here? I have an 86 C4 that is driving me insane. It will run fine but then drop on to 6 cylinders for no reason & I have trouble getting to go over 100 kmh. Also seems to run rich? I have replaced just about everything under the bonnet but nothing seems to make any difference. Has anyone had this experience & what was the problem? Hope someone can help becuase it has got to the point were I dont want to drive the car anymore. Thanks all Glenn.

gtc · « **Reply #1 on:** April 16, 2015, 08:09:44 PM »

Nah, this was your first post on here:

http://nswcorvettes.com.au/forum/index.php/topic,10419.msg1045950580.html#msg1045950580

Hope a C4 expert here can offer you some tips. Nothing worse than an unreliable vehicle. No fun at all.

77CVT · « **Reply #2 on:** April 17, 2015, 08:07:52 AM »

Are you getting any codes? Service engine light on?

glenco · « **Reply #3 on:** April 17, 2015, 04:13:43 PM »

Quote from: gtc on April 16, 2015, 08:09:44 PM

Nah, this was your first post on here:

http://nswcorvettes.com.au/forum/index.php/topic,10419.msg1045950580.html#msg1045950580

Hope a C4 expert here can offer you some tips. Nothing worse than an unreliable vehicle. No fun at all.

Cheers GTC, just shows how bad my memory is! And I didnt by that 69 either.

glenco · « **Reply #4 on:** April 17, 2015, 04:18:06 PM »

Quote from: 77CVT on April 17, 2015, 08:07:52 AM

Are you getting any codes? Service engine light on?

The service engine light is always on, has been ever since Ive had the car. And I do get codes, 3 in fact. They are 32,33 & 34. Any ideas? It points to being the maf sensor but I have tried 2 new ones & still the same.

Jethro · « **Reply #5 on:** April 17, 2015, 07:48:46 PM »

Bummer to hear your still having issue's Glenn

might have to bight the bullet and take it to Steve at S.R.Performance. Get Steve to diagnose it on the dyno once and for all

Jethro

glenco · « **Reply #6 on:** April 17, 2015, 08:42:15 PM »

Quote from: Jethro on April 17, 2015, 07:48:46 PM

Bummer to hear your still having issue's Glenn might have to bight the bullet and take it to Steve at S.R.Performance. Get Steve to diagnose it on the dyno once and for all

Jethro

How ya doin Jethro? Yeah Ive been thinking I might have to take it to someone matey, I keep chasing my tail it seems! Its the first car thats ever beaten me!! Where is S.R.Performance Jethro? You remember that I live at whoop whoop hey...

gtc · « **Reply #7 on:** April 18, 2015, 01:11:53 AM »

http://www.srperformance.com.au/

glenco · « **Reply #8 on:** April 18, 2015, 07:17:21 AM »

Quote from: gtc on April 18, 2015, 01:11:53 AM

http://www.srperformance.com.au/

Thanks for the link GTC I'll give em a call

Jethro · « **Reply #9 on:** April 18, 2015, 08:02:52 AM »

Quote from: glenco on April 17, 2015, 08:42:15 PM

How ya doin Jethro? Yeah Ive been thinking I might have to take it to someone matey, I keep chasing my tail it seems! Its the first car thats ever beaten me!! Where is S.R.Performance Jethro? You remember that I live at whoop whoop hey...

Yeah Glen but if ya want to stop chasing your tail once and for all, you'll have to
a) to have to pay for it
b) it's not going to be in your next of the woods
c)you'll need to take it to someone who has all the gear
d)and you'll need to take it to someone that has all the experience
That's Steve at S.R. Performance brother

glenco · « **Reply #10 on:** April 18, 2015, 08:59:38 AM »

Quote from: Jethro on April 18, 2015, 08:02:52 AM

Yeah Glen but if ya want to stop chasing your tail once and for all, you'll have to
a) to have to pay for it
b) it's not going to be in your next of the woods
c)you'll need to take it to someone who has all the gear
d)and you'll need to take it to someone that has all the experience
That's Steve at S.R. Performance brother

Yeah you're right Jethro, time to throw in the towel & get it sorted, I'll get on to Steve & sort something. Cheers bro

gtc · « **Reply #11 on:** April 18, 2015, 10:09:58 AM »

Glen, check your private message inbox.

sabre · « **Reply #12 on:** April 18, 2015, 03:54:55 PM »

Had similar indication in my C4 a month ago. Was EGR diagnostic switch shorted.

glenco · « **Reply #13 on:** April 18, 2015, 06:17:49 PM »

Quote from: sabre on April 18, 2015, 03:54:55 PM

Had similar indication in my C4 a month ago. Was EGR diagnostic switch shorted.

Cheers sabre. That's something I haven't looked at yet. How did you find out the problem & did you put a new switch in?

sabre · « **Reply #14 on:** April 18, 2015, 06:46:52 PM »

Quote from: glenco on April 18, 2015, 06:17:49 PM

Just followed the fault flow chart for code 32. Measured the switch. Should be open cold and found it permanently closed. Stole a replacement from project car. New switch due soon from US. Suggest you also check the MAF burn off relays. They often cause problems.
Cheers sabre. That's something I haven't looked at yet. How did you find out the problem & did you put a new switch in?

77CVT · « **Reply #15 on:** April 20, 2015, 04:20:59 PM »

Quote from: glenco on April 17, 2015, 04:18:06 PM

The service engine light is always on, has been ever since Ive had the car. And I do get codes, 3 in fact. They are 32,33 & 34. Any ideas? It points to being the maf sensor but I have tried 2 new ones & still the same.

Code #32: EGR System Failure.
Code #33: Mass Air Flow Sensor High.
Code #34: Mass Air Flow Sensor Low.

Did you disconnect the battery after swapping sensors? That will clear the codes. Check the wiring harness to the sensor is ok too.

This site might help - http://www.digitalcorvettes.com/forums/showthread.php?t=54543

glenco · « **Reply #16 on:** April 20, 2015, 04:41:44 PM »

Quote from: 77CVT on April 20, 2015, 04:20:59 PM

Code #32: EGR System Failure.
Code #33: Mass Air Flow Sensor High.
Code #34: Mass Air Flow Sensor Low.

Did you disconnect the battery after swapping sensors? That will clear the codes. Check the wiring harness to the sensor is ok too.

This site might help - http://www.digitalcorvettes.com/forums/showthread.php?t=54543

Thanks for that 77CVT. I have disconnected the battery each time I change something, but the problems always come back. To date I have tried 2 maf sensors & connector I have replaced maf relays I have replaced IAC & TPS. Have replaced evrything in the ignition system, & a new ECM, have replaced coolant temperature sensor & also O2 sensor as well as all new injectors and lastly a new fuel pump! You can see why it is driving me insane! Cheers

Jethro · « **Reply #17 on:** April 20, 2015, 05:23:43 PM »

Ahhhhh I remember those days when I had me C4 Glenn

don't seem to have those I.T. gremlins with a 69

bfit · « **Reply #18 on:** April 20, 2015, 05:42:35 PM »

Quote from: Jethro on April 20, 2015, 05:23:43 PM

Ahhhhh I remember those days when I had me C4 Glenn don't seem to have those I.T. gremlins with a 69

SO jethro your saying sell the c4 and buy a c3 preferably a 69/70 model ?
That is a way to sort the problems
Bfit

Jethro · « **Reply #19 on:** April 20, 2015, 06:21:19 PM »

Quote from: Bfit on April 20, 2015, 05:42:35 PM

SO jethro your saying sell the c4 and buy a c3 preferably a 69/70 model ?
That is a way to sort the problems
Bfit

No Bobby, just that C3 only needs Spark, Fuel & Air no computers no injection simple as an ole skool fooken tractor