Dodge ram 1996 1500 when driving at a constant speed on the freeway at 65 the rpms go up and down about 500 rpms. It runs fine when cold or at low speeds. I replace the TPS but didnt help.
Those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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No check engine light or trouble codes
I was thinking of blocking off all vacum hoses from intake manifold one at a time.
Could it be another sensor IAC, MAS
Thanks, I'll try this right now and get back to you in a couple days. Thanks a lot.
How do I clean the MAF sensor it is a solid box sensor with a inlet nipple only
if u had any kind of large vacuum leak the light would be on and u would have an O2 sensor lean code, trust me on this one.
do u have any trouble codes in memory?
at a constant acceleration rpms go down then up repeatedly then goes back to normal then goes back to surging
problem is worst after changing the iac
4.7l dodge ram idle surges. new iac didnt fix problem
I change the throtlle postion sensor,iac valve,and the purge canister. And it still have low rpms and sputter in gear whengiving it gas.
where is the egr pressure valve at.
when driving my dodge ram 1500 the tachometer surges for a few seconds
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