Question about 1990 Isuzu Amigo
When I fire up my 1990 amigo (2.6L Multi-Port fuel-injected) in the mornings it will not idol. It will only idol after the engine has wormed up to full operating temp. It also has a fuel oder (cold or worm). It doesn't leak fuel. However i'm only getting 17MPG. I've changed plugs, wires, rotar bug, cap, changed the air filter and tested the timing, Tested mass-air flow sensor, EGR, PCV. and checked for air leaks both from housings and air hoses. After it reaches operating temp it runs like a champ (still bad gas milage and slight loss of power) . I love this little vehicle and wold very much like to work out this problem.
Check the cylinder pressure. Mine does the same, and is suspected to be due to a worn cylinder or worn valves leaking. (do your valves click too?) Supposedly, the leak in pressure is causing less efficient combustion which leads to the fumes and slight loss of power / MPG. I haven't been able to open the engine to test mine yet. I am waiting until I can put in new valves, etc. before I go in.
The other thing that you may want to check is the thermostat. When my got stuck open a few years back, it had similar symptoms. Turns out when started, the engine wasn't allowed to warm up to normal operating temperature because the cooling system was triggered by the faulty temperature sensor to try to cool the engine down. Once it warmed up everything was back to normal. The most noticeable thing about this is prior to the problem, the engine would idle really high at start up for about 30-45 seconds, then settle into it's idle pur. One day it just started and immediately went to idle, and sometimes would require gas to keep it from stalling. The problem would not occur if the engine was warm. Putting in the new temperature sensor solved it.
90 Amigo, 2.6L, 2WD, 5-Spd Manual
Posted on Oct 09, 2008
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Feb 18, 2017 | 1990 Honda Accord
Sep 28, 2009 | 1990 Ford F150
Aug 14, 2009 | 1986 Pontiac Fiero
Jul 02, 2009 | 1989 GMC K1500
May 18, 2009 | 1997 Pontiac Grand Prix
Oct 28, 2008 | 1990 Mitsubishi Galant
302 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: