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Run Rich

Derek

Well-known member
Joined
Mar 21, 2002
Messages
94
Location
Melbourne,Australia
Corvette
1989 red C
Hello from down under,

My 89 C4 L98 has developed a problem,
After running normaly for 10 mins hot or cold,the engine suddenly runs very rich with soot coming from the exhaust .
I disconnect the battery for a few moments and start again ...all normal ,then after a short time RICH,with the `service engine soon` light coming on.

dont have a code reader at this time to read any codes

look forward to any ideas

:eyerole ..Derek
 

gmjunkie

Well-known member
Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
Hard to say without a Code,But there is a good chance it's the Temp sending unit not telling the ECM that the engine is warmed up!!(I've had to change several) I believe there are 2 on the 89,the one you will be looking for will be around the thermostat housing!! Could also be a Oxy sensor,you really need to check codes!! :upthumbs
Hello from down under,

My 89 C4 L98 has developed a problem,
After running normaly for 10 mins hot or cold,the engine suddenly runs very rich with soot coming from the exhaust .
I disconnect the battery for a few moments and start again ...all normal ,then after a short time RICH,with the `service engine soon` light coming on.

dont have a code reader at this time to read any codes

look forward to any ideas

:eyerole ..Derek
 

gmboileau

Active member
Joined
May 20, 2005
Messages
26
Location
Toronto
Corvette
1990 Red Convertible
Hi
Since the check engine light is coming on it's giving you a hint as to the problem. You can get the codes without a code reader by (with the key off )installing a jumper wire on the ALDL connector between pins A and B. When you turn the key to the run position the Service engine light will flash the stored codes. A code 15 would verify the temp sensor as mentioned in a previous post. Without the codes however you can replace a lot parts without fixing the problem.

Cheers
Gary
 

Derek

Well-known member
Joined
Mar 21, 2002
Messages
94
Location
Melbourne,Australia
Corvette
1989 red C
Hello again.
Thanks guys for the info,I ran the car for hour ..can you figure ,it wouldnt fault??:mad ;shrug
runs ok for now.
But when it does I`ll be ready to read any codes it may throw.In the mean time I will check for loose connectors on the thermal and O2 sensors.
thanks again,this forum is a great resource.
:)
 

MIKEM3401

Member
Joined
Dec 28, 2006
Messages
13
Location
Simi Valley
Corvette
1995 white coupe
Derek,

Just resolved the same issue last month on my 95 C4.
It is definetly the O2 sensor.

MikeM
 

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