Check Engine: insufficient EGR flow
#1
10-20-2002, 11:11 PM
Join Date: Jan 2002
Location: Moore, OK
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
Check Engine: insufficient EGR flow
I Have a '97 f-150 5.4. a week ago check engine light came on. Took it to Autozone to run code. It came back as "insufficient EGR flow/pressure". The guy said it would either be EGR valve or sensor, ot it could be carboned up. I bought the EGR sensor, light came back on. Today I replaced the EGR valve, reused the old gasket, didn't clean out EGR tube or hole in motor. Light came back on. I don't know what else to do.
#4
10-21-2002, 11:31 AM
It is a very common modular engine problem. The passage between the EGR valve and the intake manifold is plugged with carbon. You will need to remove the EGR valve and the plenum (90 degree elbow which the TB and EGR are bolted to). Use a long rod an carb cleaner to clean out the passage. You will need a new EGR gasket and may be a TB and plenum gasket (I was able to reuse mine).
#6
10-22-2002, 09:40 AM
Senior Member
Join Date: Sep 2002
Location: Austin, Tx.
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
#7
10-22-2002, 07:23 PM
Senior Member
Join Date: Sep 2002
Location: Wisconsin
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
Put a vacuum gauge TEEd into the egr hose, and monitor the gauge. If the gauge does NOT move, you have a control side problem.
VEry common problem is the lines near the battery get rotted, (corroded off/away), and leak like hell.
EAsy fix. Repair the vacuum lines.
In either case, ya gotta know if the egr valve is even opening first!.............
My .002
VEry common problem is the lines near the battery get rotted, (corroded off/away), and leak like hell.
EAsy fix. Repair the vacuum lines.
In either case, ya gotta know if the egr valve is even opening first!.............
My .002
Trending Topics
#8
10-22-2002, 08:37 PM
#9
10-22-2002, 10:13 PM
Senior Member
Join Date: Sep 2002
Location: Wisconsin
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
sorry...........
Sorry I wasn't more specific.
Yes, you would have to drive the vehicle, (engine at operating temp), to do it the way I described.
Easier way to ck the lines. Just put a hand held vacuum pump on one end at the EGRC solenoid, and monitor the vacuum at the valve.
Vice versa with the control side of the vacuum, (red line), from manifold to egrc solenoid.
No big deal.
Yes, you would have to drive the vehicle, (engine at operating temp), to do it the way I described.
Easier way to ck the lines. Just put a hand held vacuum pump on one end at the EGRC solenoid, and monitor the vacuum at the valve.
Vice versa with the control side of the vacuum, (red line), from manifold to egrc solenoid.
No big deal.