Question about 1995 Geo Tracker
Egr intake hose
Not a good sign. which engine, 8valve or 16v? MATTERS BIG TIME.
do you run 50% Antifreeze (AF) or just hope it dont freeze and crack the head.? (anything with AF in it can crack, anypart)
the EGR has only 3 ports.
1 is vacuum
the other 2 are exhaust.
my guess is that you removed egr, (you forgot to say)
and the black carbon ports , in valve dripped green AF.
that means the intake manifold is cracked, and AF is pouring
in to there, or the head is cracked.
if the vacuum hose (you didnt say ) is full of AF, that is near impossible. its a very tiny hose.
use this page to find the correct part, and say where it leaks exactly
or post photo of object.
8v or 16V?
the 8v EGR is below the TBI
the 16v is at the rear (MPI) intake manifold very hard to get to.
ill take a wild guess.?
and its 8 valve engine.
part #1 EGR leaks
or was it REALLY the ISC?
the ISC has 3 hoses, not 1, , one is air, 2 are AF (water)
post back and we can do other tests. like compression test
or radiator leak down test. (fumes test)(
Posted on Apr 21, 2014
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Posted on Jan 02, 2017
Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.
Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.
Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.
Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.
If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.
Hope this helps and good luck!
Posted on Jan 12, 2009
SOURCE: egr valve location
The EGR Valve Location is typically housed on the intake manifold this schematic may help you
Posted on Mar 07, 2009
Had same problem and cleaning out port where the exhaust tube enters the intake solved the problem. This tube runs from near the EGR valve up to the intake. Two 10mm bolts on each end. Simple fix and cost is only time. 15min.
Posted on Dec 13, 2010
SOURCE: I replaced the EGR valve
The air flow through the EGR is usually detected by a DPFE (differential Pressure Feedback Exhaust) sensor. The DPFE is connected by two pipes/ports on the exhaust feed pipe leading to the EGR. This sensor measures the pressure difference (differential) in the two pipes when the EGR is open; the more open the EGR the more the pressure imbalance detected by the DPFE. If the pipes/ports to the DPFE become clogged or the sensor malfunctions, the signal to the ECU will be seen as incorrect as compared to how much the EGR has opened...'insufficient air flow'. It is just as likely for the DPFE to fail as the EGR when there are 'EGR problems' . Hope this gives you another thing to check
Posted on Sep 21, 2011
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