Hello everyone. I bought this 96 Camry a few months ago - it had a missfire and a P0304 code which I traced to a broken seal on no 4 fuel injector which caused a massive vacuum leak. I fixed it by changing all the injector seals and sure enough the check engine light turned off.

However, since then the car has idled at a very low speed 300-400 and will often stall. When I start it, the engine runs for a second or two then dies. The only way I can keep it running is by keeping my foot on the accelerator for a minute or two, slowly coming off until the idle settles at around the 400 RPM mark. Now the check engine light came back on - this time with a P0401 code - exhaust EGR flow insufficient.

The EGR valve and VSV both seem to check out when I test them. I attached my vacuum tester to port Q on the EGR modulator. With the engine revving around 2500-3000 RPM there was no movement of the needle. I understand this means the EGR modulator is not working (according to one you tube video). So I ordered a new EGR modular - I suppose I should just wait for it to arrive and see if it works, but is this likely to fix the low idle problem? I already cleaned the IAC a month ago.....

Thanks

 

EGR is off at idle. Make sure its off at idle.

IAC valve controls idle speed. Did you make any changes to that system?

Are all connectors, hoses, etc in place?