5 symptoms need help diagnosing, added a problem... probably culprit |
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5 symptoms need help diagnosing, added a problem... probably culprit |
steveherman |
Oct 17 2010, 08:36 PM
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#1
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Member Group: Members Posts: 380 Joined: 12-September 09 From: Kissimmee Florida Member No.: 10,799 Region Association: South East States |
Working on a 1974 2.0 d-jet
-symptom 1- when i start it... idle is very low no where near the 1600 rpm as Brad mentions -symptom 2- low idle...like 550 rpm -symptom 3- when coming to a stop it almost dies -symptom 4- stomp on gas when sitting and driving it goes blah... then takes off. -symptom 5- as it warms up loses a little power things to note: -there are 20 clicks when pushing down accelerator so tps is correct -timing and dwell were checked today and they were within spec. -lifters just adjusted |
john rogers |
Oct 19 2010, 10:17 PM
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#2
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
You did not mention what the fuel pressure is? Should be stock or a pound high is okay too. When you checked the timing, was the vacuum line unhooked and is it hooked up to the "retard" side of the advance mechanism? On 1974 2L D-Jet models it is to pull the timing back to help with cleaner emissions and advance is all mechanical unless you have a dual ported throttle body and in that case make sure the hoses are connected correctly. As mentioned, the butterfly bypass should allow the engine to speed up at idle and you can hear the change in air flow through it when opening it up.
Finally, I would spray some carb cleaner around the injectors at their seal locations so you can be sure the seals are not leaking by. |
steveherman |
Oct 20 2010, 06:38 AM
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#3
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Member Group: Members Posts: 380 Joined: 12-September 09 From: Kissimmee Florida Member No.: 10,799 Region Association: South East States |
You did not mention what the fuel pressure is? Should be stock or a pound high is okay too. When you checked the timing, was the vacuum line unhooked and is it hooked up to the "retard" side of the advance mechanism? On 1974 2L D-Jet models it is to pull the timing back to help with cleaner emissions and advance is all mechanical unless you have a dual ported throttle body and in that case make sure the hoses are connected correctly. As mentioned, the butterfly bypass should allow the engine to speed up at idle and you can hear the change in air flow through it when opening it up. Finally, I would spray some carb cleaner around the injectors at their seal locations so you can be sure the seals are not leaking by. front was unhooked the back was hooked up to the throttle body is the retard side the back? the air bypass on mine is completely closed. |
rick 918-S |
Oct 20 2010, 06:46 AM
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#4
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Hey nice rack! -Celette Group: Members Posts: 20,680 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
You did not mention what the fuel pressure is? Should be stock or a pound high is okay too. When you checked the timing, was the vacuum line unhooked and is it hooked up to the "retard" side of the advance mechanism? On 1974 2L D-Jet models it is to pull the timing back to help with cleaner emissions and advance is all mechanical unless you have a dual ported throttle body and in that case make sure the hoses are connected correctly. As mentioned, the butterfly bypass should allow the engine to speed up at idle and you can hear the change in air flow through it when opening it up. Finally, I would spray some carb cleaner around the injectors at their seal locations so you can be sure the seals are not leaking by. front was unhooked the back was hooked up yo the throttle body is the retard side the back? the air bypass on mine is completely closed. Sounds like your on track. Here is a hose diagram. Take the AAR out and test it. Attached image(s) |
steveherman |
Oct 20 2010, 07:32 AM
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#5
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Member Group: Members Posts: 380 Joined: 12-September 09 From: Kissimmee Florida Member No.: 10,799 Region Association: South East States |
Sounds like your on track. Here is a hose diagram. Take the AAR out and test it. i just noticed a difference in diagram from PP site. the middle hose from the decel valve is shown hooked up in different places. on pp it goes to the air cleaner and the one rick showed it goes under throttle body. the back hose on pp goes under the throttle body and the one rick shows it goes to the air cleaner box. which is right? AAR is good... heats up nicely and opens and closes |
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